feat(flake): Added subflake

So as to not specify fetchFromGitHub commit hashes
Added mullvad packages

flakes/flake.nix

@@ -0,0 +1,26 @@
+{
+  description = "Get all overlays as subflakes";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    nvim-devdocs.url = "github:luckasRanarison/nvim-devdocs";
+    nvim-devdocs.flake = false;
+  };
+  outputs = {
+    nixpkgs,
+    flake-utils,
+    ...
+  } @ inputs: let
+    overlay = final: prev: {
+      vimPlugins =
+        prev.vimPlugins
+        // {
+          nvim-devdocs = final.pkgs.vimUtils.buildVimPlugin {
+            pname = "nvim-devdocs";
+            version = "0.4.1";
+            src = inputs.nvim-devdocs;
+          };
+        };
+    };
+  in {overlays.default = overlay;};
+}