adwaita-papyrus-dark: new theme (#25)

* adwaita-papirus-dark: add initial version

* adwaita-papirus-dark: add rounded shade and desk icons

* adwaita-papirus-dark: tweak colors

* adwaita-papirus-dark: tweak colors for menu hover

* adwaita-papirus-dark: make shade and desk icons squared

Similar to the menu button.

* adwaita-papirus-dark: add simple readme

* adwaita-papirus-dark: use other shade icon

* adwaita-papirus-dark: use other desk/toggled icon

* adwaita-papirus-dark: update readme

* adwaita-papirus-dark: revert to old shade icon

* adwaita-papirus-dark: update readme

* adwaita-papirus-dark: screenshot

* adwaita-papirus-dark: embed screenshot

* adwaita-papirus-dark: links

* adwaita-papirus-dark: gnome tweak settings

* adwaita-papirus-dark: update fonts

* adwaita-papirus-dark: embed screenshot

Author: jp7677

themes/Adwaita-Papirus-dark/README.md

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+# Adwaita Papirus Dark
+
+This theme tries to mimic the appearance of the [Adwaita Dark GTK](https://gnome.pages.gitlab.gnome.org/libadwaita/) theme together with the Pairus Dark icon theme.
+
+Recommended `rc.xml` theme settings:
+
+```xml
+  <theme>
+    <name>Adwaita-Papirus-Dark</name>
+    <titlebar layout=":menu,iconify,max,close" showTitle="yes" />
+    <cornerRadius>14</cornerRadius>
+    <dropShadows>yes</dropShadows>
+    <font place="ActiveWindow" name="Cantarell" size="12" weight="bold" />
+    <font place="InactiveWindow" name="Cantarell" size="12" weight="bold" />
+    <font place="MenuHeader" name="Cantarell" size="12" weight="bold" />
+    <font place="MenuItem" name="Cantarell" size="12" />
+    <font place="OnScreenDisplay" name="Cantarell" size="12" />
+  </theme>
+```
+
+Recommended Gnome Tweaks settings:
+
+- Appearance
+  - Icons: Papirus-Dark
+  - Legacy Applications (GTK3): Adw-gtk3-dark
+- Titlebar Buttons
+  - Maximize: On
+  - Minimize: On
+  - Placement: Right
+
+The icons are based on the icons found in the [Adwaita-dark button theme](https://github.com/labwc/labwc-artwork/tree/main/button-themes/svg/Adwaita-dark) in this repository and on the icons of the great [Papirus icon theme](https://github.com/PapirusDevelopmentTeam/papirus-icon-theme).
+
+Obligatory screenshot:
+
+![Screenshot](https://github.com/user-attachments/assets/8752fbb5-7ff7-4973-8f55-94cdbf6e331d)