treewide: format all files (#57)

Run `nix fmt` at the root of the repository to format all files. I've
done this on my fork and this will help me merge your changes later
without having to deal with un-formatted files.

config/plugins/utils/extra_plugins.nix

@@ -1,4 +1,7 @@
-{pkgs, ...}: {
-  extraPlugins = with pkgs.vimPlugins; [
-  ];
+{ pkgs, ... }:
+{
+  extraPlugins =
+    with pkgs.vimPlugins;
+    [
+    ];
 }

config/plugins/utils/mini.nix

@@ -9,7 +9,7 @@
           try_as_border = true;
         };
       };
-      surround = {};
+      surround = { };
     };
   };
 }

config/plugins/utils/obsidian.nix

@@ -12,7 +12,7 @@
         subdir = "templates";
         dateFormat = "%Y-%m-%d";
         timeFormat = "%H:%M";
-        substitutions = {};
+        substitutions = { };
       };
 
       dailyNotes = {