feat(nvim): reworked cmp, lsp and bunch of stuff (#48)

* feat(nvim): reworked cmp, lsp and bunch of stuff

* chore: del disabled plugins, do coderabbit fixes

* chore: tweak settings, remove duplication

* chore: next round of refactoring

* feat: replaced lualine w/ mini.statusline, tweaks

* chore: cleanup, options and keymap stuff

config/nvim/lua/plugins/lsp-saga.lua

@@ -1,21 +0,0 @@
--- improve neovim lsp experience
--- https://github.com/nvimdev/lspsaga.nvim
--- https://nvimdev.github.io/lspsaga/
-return {
-  'nvimdev/lspsaga.nvim',
-  event = 'LspAttach',
-  dependencies = {
-    'nvim-treesitter/nvim-treesitter', -- optional
-    'nvim-tree/nvim-web-devicons', -- optional
-  },
-  opts = {
-    code_action = {
-      show_server_name = true,
-    },
-    diagnostic = {
-      keys = {
-        quit = { 'q', '<ESC>' },
-      },
-    },
-  },
-}