refactor: update dotfiles paths and remove obsolete configurations

config/home-manager/workstation/dconf.nix

@@ -5,15 +5,15 @@
     enable = true;
 
     iconTheme = {
-      name = "Adwaita";
+      name = "Yaru";
     };
 
     theme = {
-      name = "Adwaita";
+      name = "Yaru";
     };
 
     cursorTheme = {
-      name = "Adwaita";
+      name = "Yaru";
     };
 
     gtk3.extraConfig = {
@@ -51,7 +51,7 @@
       # add more by listing them with `dconf read /org/gnome/shell/favorite-apps | sed "s/,//g; s/'/\"/g"` then copy pasting the output here
       "org/gnome/shell" = {
         favorite-apps = [
-          "ZenBrowser.desktop"
+          "zen.desktop"
           "org.gnome.Nautilus.desktop"
           "com.spotify.Client.desktop"
           "vesktop.desktop"