docs: fix sidebar not opening / add catpuccin theme

Overridden CSS files had to be udpdated to newer versions.

.prettierignore

@@ -1,4 +1,5 @@
 .github/**
-flake.lock
 docker-compose/**
-secrets/**
+docs/theme/index.hbs
+flake.lock
+secrets/**

docs/book.toml

@@ -7,8 +7,21 @@ src = "src"
 title = "Garuda's infra documentation"
 
 [output.html]
-additional-css = ["theme/css/custom.css"]
-default-theme = "navy"
+additional-css = ["./mdbook-admonish.css", "theme/css/custom.css", "./theme/catppuccin.css", "./theme/catppuccin-admonish.css"]
+default-theme = "mocha"
+preferred-dark-theme = "mocha"
 git-repository-icon = "fa-code-fork"
 git-repository-url = "https://github.com/garuda-linux/infrastructure-nix"
-site-url = "https://docs.garudalinux.net"
+site-url = "https://docs.garudalinux.net"
+
+[preprocessor]
+
+[preprocessor.admonish]
+after = ["links"]
+command = "mdbook-admonish"
+assets_version = "3.0.2" # do not edit: managed by `mdbook-admonish install`
+
+[preprocessor.catppuccin]
+assets_version = "2.1.0" # DO NOT EDIT: Managed by `mdbook-catppuccin install`
+
+[preprocessor.emojicodes]