refactor!(haskell): remove ghcide support

BREAKING CHANGE: ghcide was archived a while back and now primarily
exists as a library used in the development of haskell-language-server.
It is not recommended for end-users, only for development. To this end I
think including it in the module is more misleading than helpful, and
the people that really want to use it can easily set it up themselves.

Ref: https://github.com/haskell/ghcide/pull/939

modules/lang/haskell/+lsp.el

@@ -4,8 +4,5 @@
   :after lsp-mode
   :preface (add-hook 'haskell-mode-local-vars-hook #'lsp!)
   :config
-  (when (featurep! +ghcide)
-    (setq lsp-haskell-server-path "ghcide"
-          lsp-haskell-server-args nil))
   ;; Does some strange indentation if it pastes in the snippet
   (setq-hook! 'haskell-mode-hook yas-indent-line 'fixed))