feat(nvim): mini.nvim plugins + cleanup

config/nvim/lua/plugins/treesj.lua

@@ -1,9 +0,0 @@
--- Neovim plugin for splitting/joining blocks of code
--- https://github.com/Wansmer/treesj
-return {
-  'Wansmer/treesj',
-  dependencies = { 'nvim-treesitter/nvim-treesitter' },
-  opts = {
-    use_default_keymaps = false,
-  },
-}