Add multi-user support for package installations across various modules

Updated multiple configuration files to include a `merge` option for user management, enhancing the ability to handle multi-user setups for applications and services. This change improves flexibility in managing user-specific package installations, ensuring a more streamlined configuration process.

config/base.nix

@@ -168,37 +168,38 @@
   };
   fonts = {
     fontconfig.enable = true;
-    packages = let
-      customFonts = pkgs.stdenvNoCC.mkDerivation {
-        name = "custom-fonts";
-        src = inputs.fonts;
-        installPhase = ''
-          mkdir -p $out/share/fonts
-          find $src -type f \( \
-            -name "*.ttf" -o \
-            -name "*.otf" -o \
-            -name "*.woff" -o \
-            -name "*.woff2" \
-          \) -exec cp {} $out/share/fonts/ \;
-        '';
+    packages =
+      let
+        customFonts = pkgs.stdenvNoCC.mkDerivation {
+          name = "custom-fonts";
+          src = inputs.fonts;
+          installPhase = ''
+            mkdir -p $out/share/fonts
+            find $src -type f \( \
+              -name "*.ttf" -o \
+              -name "*.otf" -o \
+              -name "*.woff" -o \
+              -name "*.woff2" \
+            \) -exec cp {} $out/share/fonts/ \;
+          '';
+        };
+      in
+      builtins.attrValues {
+        inherit customFonts;
+        inherit (pkgs)
+          symbola
+          comic-neue
+          cascadia-code
+          corefonts
+          ;
+        inherit (pkgs.nerd-fonts)
+          caskaydia-cove
+          open-dyslexic
+          comic-shanns-mono
+          iosevka
+          agave
+          ;
       };
-    in
-    builtins.attrValues {
-      inherit customFonts;
-      inherit (pkgs)
-        symbola
-        comic-neue
-        cascadia-code
-        corefonts
-        ;
-      inherit (pkgs.nerd-fonts)
-        caskaydia-cove
-        open-dyslexic
-        comic-shanns-mono
-        iosevka
-        agave
-        ;
-    };
   };
   powerManagement.cpuFreqGovernor = lib.mkDefault "performance";
 }