feat(plugins, keymaps): Add plugins, move plugins to nix, update keymaps

Added:
  - [aerial.nvim](https://github.com/stevearc/aerial.nvim)
  - [better-escape.nvim](https://github.com/max397574/better-escape.nvim)
  - [dressing.nvim](https://github.com/stevearc/dressing.nvim)
  - [ident-blankline.nvim](https://github.com/lukas-reineke/indent-blankline.nvim)
  - [nvim-notify](https://github.com/rcarriga/nvim-notify)
  - [todo-comments.nvim](https://github.com/folke/todo-comments.nvim)

Moved plugin source from Github to Nix:
  - [Comment.nvim](https://github.com/numToStr/Comment.nvim)
  - [neo-tree.nvim](https://github.com/numToStr/Comment.nvim)

Mapped windown switching to `<C-h`... instead of `<M-h`...
Moved some coliding lsp keymaps under the `<leader>l` group
  - Eg. `<leader>ls` for signature help

flake.lock

@@ -1,21 +1,5 @@
 {
   "nodes": {
-    "comment-nvim": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1717957420,
-        "narHash": "sha256-h0kPue5Eqd5aeu4VoLH45pF0DmWWo1d8SnLICSQ63zc=",
-        "owner": "numToStr",
-        "repo": "Comment.nvim",
-        "rev": "e30b7f2008e52442154b66f7c519bfd2f1e32acb",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numToStr",
-        "repo": "Comment.nvim",
-        "type": "github"
-      }
-    },
     "flake-compat": {
       "flake": false,
       "locked": {
@@ -151,22 +135,6 @@
         "type": "github"
       }
     },
-    "neotree": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1726542367,
-        "narHash": "sha256-Lqt0KJNT9HmpJwZoWChYeVBrDWhscRe8COqVCwgcTwk=",
-        "owner": "nvim-neo-tree",
-        "repo": "neo-tree.nvim",
-        "rev": "a77af2e764c5ed4038d27d1c463fa49cd4794e07",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nvim-neo-tree",
-        "repo": "neo-tree.nvim",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1718714799,
@@ -245,10 +213,8 @@
     },
     "root": {
       "inputs": {
-        "comment-nvim": "comment-nvim",
         "flake-utils": "flake-utils",
         "gen-luarc": "gen-luarc",
-        "neotree": "neotree",
         "nixpkgs": "nixpkgs_2",
         "presence-nvim": "presence-nvim"
       }