feat: make AGS colorshell configuration fully declarative

- Add complete colorshell v2.0.3 configuration to home/ags-config/
- Disable runner plugin and NightLight tile (incompatible with NixOS)
- Customize SCSS with full opacity (no transparency)
- Add dark pale blue color scheme in home/pywal-colors/
- Configure Papirus-Dark icon theme via home-manager
- Make ~/.config/ags/ immutable and managed by Nix store
- Auto-deploy pywal colors to ~/.cache/wal/colors.json

All AGS configuration is now reproducible and version controlled.

home/ags-config/runner/plugins/apps.ts

@@ -0,0 +1,18 @@
+import { execApp, getAstalApps, lookupIcon, updateApps } from "../../modules/apps";
+import { Runner } from "../Runner";
+
+export const PluginApps = {
+    // Do not provide prefix, so it always runs.
+    name: "Apps",
+    // asynchronously-refresh apps list on init
+    init: async () => updateApps(),
+    handle: (text: string) => {
+        return getAstalApps().fuzzy_query(text).map(app => ({
+                title: app.get_name(),
+                description: app.get_description(),
+                icon: lookupIcon(app.iconName) ? app.iconName : "application-x-executable-symbolic",
+                actionClick: () => execApp(app)
+            })
+        );
+    }
+} as Runner.Plugin;