* When using gtk as the backend, link libadwaita
* Update c.zig
* Use libadwaita's theme manager for gtk
* update the documentation for window-theme
* build: add libadwaita to the nix devshell
* forgot to properly import libadwaita
* apprt/gtk: adwaita style change
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Co-authored-by: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>