fix links (#2029)

Co-authored-by: Devin Logan <devinannlogan@gmail.com>

Author: davidkonigsberg

fern/products/docs/pages/ai/mcp-server.mdx

@@ -48,7 +48,7 @@ To connect to your MCP server:
 
 AI agents can access your documentation, including authenticated documentation, directly via HTTP. Fern serves content as clean Markdown for token efficiency.
 
-For authenticated sites, agents obtain a JWT via [`/api/fern-docs/get-jwt`](/learn/docs/ai-features/mcp-server/api-reference/get-jwt) with a Fern API key to access the protected documentation content and search functionality.
+For authenticated sites, agents obtain a JWT via [`/api/fern-docs/get-jwt`](/learn/docs/fern-api-reference/get-jwt) with a Fern API key to access the protected documentation content and search functionality.
 
 ```bash Access protected content
 curl https://docs.example.com/platform/overview \

fern/products/docs/pages/component-library/custom-components/css-selectors.mdx

@@ -540,7 +540,7 @@ Container for grouping multiple buttons together.
 
 <Accordion title=".fern-copy-button">
 
-Button for copying code snippets or text, appears on hover over [code blocks](/learn/docs/component-library/default-components/code-blocks).
+Button for copying code snippets or text, appears on hover over [code blocks](/learn/docs/writing-content/components/code-blocks).
 
 ```css Default CSS
 .fern-copy-button {
@@ -569,7 +569,7 @@ Button for expanding code blocks or collapsible content, appears on [code blocks
 
 ## Card components
 
-Selectors for [card-style content blocks](/learn/docs/component-library/default-components/cards) with interactive and elevated variants.
+Selectors for [card-style content blocks](/learn/docs/writing-content/components/cards) with interactive and elevated variants.
 
 <AccordionGroup>
 <Accordion title=".fern-card">
@@ -1209,7 +1209,7 @@ Icon at the end of selection item (e.g., arrow).
 
 <Accordion title=".fern-product-selector">
 
-Container for product selection dropdown applied to the FernDropdown component wrapper. Custom styling can be applied for specific layouts. See the [fern-api/docs repo `styles.css` file](https://github.com/fern-api/docs/blob/main/fern/styles.css) for advanced customization examples.
+Container for product selection dropdown applied to the FernDropdown component wrapper. Custom styling can be applied for specific layouts. See the [fern-api/docs repo `styles.css` file](https://github.com/fern-api/docs/blob/main/fern/assets/styles.css) for advanced customization examples.
 
 ```css Default CSS
 .fern-product-selector {
@@ -1227,14 +1227,14 @@ Container for product selection dropdown applied to the FernDropdown component w
 
 <Accordion title=".fern-product-selector-radio-group">
 
-Radio button group within the product selector dropdown. Can be customized with CSS grid for multi-column layouts. See the [fern-api/docs repo `styles.css` file](https://github.com/fern-api/docs/blob/main/fern/styles.css) for examples.
+Radio button group within the product selector dropdown. Can be customized with CSS grid for multi-column layouts. See the [fern-api/docs repo `styles.css` file](https://github.com/fern-api/docs/blob/main/fern/assets/styles.css) for examples.
 
 </Accordion>
 </AccordionGroup>
 
 ## Accordion components
 
-Selectors for [expandable accordion containers](/learn/docs/component-library/default-components/accordions), items, triggers, and animations.
+Selectors for [expandable accordion containers](/learn/docs/writing-content/components/accordions), items, triggers, and animations.
 
 <AccordionGroup>
 <Accordion title=".fern-accordion">
@@ -1497,7 +1497,7 @@ Corner element where horizontal and vertical scrollbars meet.
 
 ## Badge components
 
-Selectors for [small labels and status indicators](/learn/docs/component-library/default-components/badges), including HTTP method and status code badges.
+Selectors for [small labels and status indicators](/learn/docs/writing-content/components/badges), including HTTP method and status code badges.
 
 <AccordionGroup>
 <Accordion title=".fern-docs-badge">
@@ -1594,7 +1594,7 @@ Styled link element in documentation content. External links automatically get a
 
 <Accordion title=".fern-callout">
 
-Highlighted [callout](/learn/docs/component-library/default-components/callouts) box for important information. Each intent has matching background, border, and text colors, and icons within callouts are automatically colored.
+Highlighted [callout](/learn/docs/writing-content/components/callouts) box for important information. Each intent has matching background, border, and text colors, and icons within callouts are automatically colored.
 
 ```css Default CSS
 .fern-callout {
@@ -1624,7 +1624,7 @@ Highlighted [callout](/learn/docs/component-library/default-components/callouts)
 
 <Accordion title=".fern-steps">
 
-Container for [step-by-step instructions](/learn/docs/component-library/default-components/steps).
+Container for [step-by-step instructions](/learn/docs/writing-content/components/steps).
 
 ```css Default CSS
 .fern-steps {
@@ -1640,7 +1640,7 @@ Container for [step-by-step instructions](/learn/docs/component-library/default-
 
 <Accordion title=".fern-step">
 
-Single step in [steps component](/learn/docs/component-library/default-components/steps).
+Single step in [steps component](/learn/docs/writing-content/components/steps).
 
 ```css Default CSS
 .fern-step > .fern-anchor {
@@ -1654,7 +1654,7 @@ Single step in [steps component](/learn/docs/component-library/default-component
 
 <Accordion title=".fern-anchor">
 
-Anchor link for [deep linking to sections](/learn/docs/component-library/default-components/anchor). Positioned absolutely within step components and includes a `.fern-anchor-icon` child element with hover and copied states.
+Anchor link for [deep linking to sections](/learn/docs/writing-content/components/anchor). Positioned absolutely within step components and includes a `.fern-anchor-icon` child element with hover and copied states.
 
 ```css Default CSS
 a.fern-anchor {
@@ -1724,7 +1724,7 @@ Root container for table component with card-style styling. Used for custom tabl
 
 <Accordion title=".fern-table">
 
-Styled table element with consistent spacing and borders. Supports a `.sticky` modifier for [sticky table headers](/learn/docs/component-library/default-components/sticky-tables) that remain visible during scrolling.
+Styled table element with consistent spacing and borders. Supports a `.sticky` modifier for [sticky table headers](/learn/docs/writing-content/components/sticky-tables) that remain visible during scrolling.
 
 ```css Default CSS
 .fern-table {
@@ -1842,7 +1842,7 @@ Metadata for API property (type, required, etc.).
 
 ## Utility components
 
-Selectors for miscellaneous utility elements like highlights, [icons](/learn/docs/component-library/default-components/icons), [tooltips](/learn/docs/component-library/default-components/tooltips), and footer.
+Selectors for miscellaneous utility elements like highlights, [icons](/learn/docs/writing-content/components/icons), [tooltips](/learn/docs/writing-content/components/tooltips), and footer.
 
 <AccordionGroup>
 <Accordion title=".fern-highlight">
@@ -1978,7 +1978,7 @@ Child element within collapsible content for nested collapsible sections. Automa
 
 <Accordion title=".fern-runnable-endpoint">
 
-[Interactive API endpoint that can be executed](/learn/docs/component-library/default-components/runnable-endpoint) in API playground features. Provides special styling for lists, buttons, and disabled inputs within the component.
+[Interactive API endpoint that can be executed](/learn/docs/writing-content/components/runnable-endpoint) in API playground features. Provides special styling for lists, buttons, and disabled inputs within the component.
 
 ```css Default CSS
 .fern-runnable-endpoint ul {

fern/products/docs/pages/component-library/custom-components/custom-css-js.mdx

@@ -8,7 +8,7 @@ This page covers how to customize your docs with CSS, JavaScript, and custom com
 
 ## Custom CSS
 
-You can add custom CSS to your docs to further customize the look and feel. The defined class names are applied across all MDX files. See the [CSS selectors reference](/learn/docs/component-library/custom-components/css-selectors) for a complete list of available `.fern-*` selectors.
+You can add custom CSS to your docs to further customize the look and feel. The defined class names are applied across all MDX files. See the [CSS selectors reference](/learn/docs/customization/css-selectors-reference) for a complete list of available `.fern-*` selectors.
 
 <Steps>
 ### Create `styles.css`
@@ -72,7 +72,7 @@ to display.
     ```
 </CodeBlock>
 
-You can target other Fern UI components using their CSS class names. See the [CSS selectors reference](/learn/docs/component-library/custom-components/css-selectors) for all available selectors, or use your browser's developer tools to inspect elements. 
+You can target other Fern UI components using their CSS class names. See the [CSS selectors reference](/learn/docs/customization/css-selectors-reference) for all available selectors, or use your browser's developer tools to inspect elements. 
 </Accordion>
 <Accordion title="Adding custom styling">