Revert "Temporarily disable all packages in overlay"

This reverts commit bc0c2abdbe.

overlay.nix

@@ -1,6 +1,6 @@
 self: super:
 
 {
-    # pegasus = super.callPackage ./pegasus/default.nix {};
-    # blog = super.callPackage ./blog/default.nix {};
+    pegasus = super.callPackage ./pegasus/default.nix {};
+    blog = super.callPackage ./blog/default.nix {};
 }