fix: rm evil-collection from overrides

This change was added to allow evil-collection to compile on latest
versions macOS Ventura, the evil-collection version at the time of this
change was halting on the compilation of the
`evil-collection-speedbar.el` file.

Unfortunately, with this approach, although it finishes the nix-doom
emacs compilation, leaves doom-emacs' runtime in a faulty state. The
emacs package relies on a sub-directory `modes` that doesn't get
compiled when specifying this dependency in the overrides list.

As a way to make it work as expected on macOS Ventura, users should
override the `emacsPackagesOverlay` option and specify the
`evil-collection` variable. Following an example

```
{ pkgs, ... }:
{
  programs.doom-emacs = {
    enable = true;
    emacsPackagesOverlay = _final: _prev: {
        inherit (pkgs.emacsPackages) evil-collection;
    };
  };
}
```

flake.lock

@@ -66,22 +66,6 @@
         "type": "github"
       }
     },
-    "evil-collection": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1686801899,
-        "narHash": "sha256-wGJWF9t8yaxLyYQRf3hK+5/AIYYAS8qWXPDEvatzBlc=",
-        "owner": "emacs-evil",
-        "repo": "evil-collection",
-        "rev": "4a7d924dbd851ef1b2ccb85778be6e7a6a81ebd4",
-        "type": "github"
-      },
-      "original": {
-        "owner": "emacs-evil",
-        "repo": "evil-collection",
-        "type": "github"
-      }
-    },
     "evil-escape": {
       "flake": false,
       "locked": {
@@ -362,7 +346,6 @@
         "doom-snippets": "doom-snippets",
         "emacs-overlay": "emacs-overlay",
         "emacs-so-long": "emacs-so-long",
-        "evil-collection": "evil-collection",
         "evil-escape": "evil-escape",
         "evil-markdown": "evil-markdown",
         "evil-org-mode": "evil-org-mode",