Added Vitepress config to ignore dead links and updated .gitignore to ignore Vitepress build files

Author: kartefact

.gitignore

@@ -1,2 +1,4 @@
 *node_modules
-folder-structure.txt
+folder-structure.txt
+docs/.vitepress/dist
+docs/.vitepress/cache

docs/.vitepress/config.mjs

@@ -1,6 +1,7 @@
 import { defineConfig } from 'vitepress'
 
 export default defineConfig({
+  ignoreDeadLinks: true, // Ignores all dead links during build
   title: 'abap2xlsx Documentation',
   description: 'Documentation for abap2xlsx, a library for generating and manipulating Excel files in ABAP.',
   base: '/docs/',