nvim: plugins: Drop Coqtail

We are not gonna be pursuing studying Coq for quite a long while and
dropping this should allow us to drop Python provider, so drop this.

nvim/.config/nvim/lua/plugins.lua

@@ -73,8 +73,6 @@ local init = function ()
   -- Language support & syntax highlighting
   use 'mfussenegger/nvim-lint'
   use 'simrat39/rust-tools.nvim'
-  -- Coq
-  use 'whonore/Coqtail'
   -- treesitter based syntax highlighting
   use {
     'nvim-treesitter/nvim-treesitter',