Nvim: modernize config + some tweaks in lsp

.config/nvim/init.vim

@@ -51,6 +51,7 @@ Plug 'hrsh7th/cmp-cmdline'
 Plug 'hrsh7th/cmp-calc'
 Plug 'joshzcold/cmp-jenkinsfile'
 Plug 'petertriho/cmp-git'
+Plug 'mstanciu552/cmp-matlab'
 Plug 'SirVer/ultisnips' | Plug 'honza/vim-snippets'
 Plug 'quangnguyen30192/cmp-nvim-ultisnips'
 " }}}
@@ -198,6 +199,8 @@ set undofile
 "let mapleader = "\\"
 nmap <space> <leader>
 
+tnoremap <ESC><ESC> <C-\><C-n>
+
 inoremap jj <ESC>
 inoremap jk <ESC>
 "inoremap :w<CR> <Esc>:w<CR>
@@ -256,3 +259,4 @@ let g:blamer_relative_time = 0
 "  gui settings  "
 """"""""""""""""""
 set guifont=Monoid\ Nerd\ Font:h8
+let g:neovide_cursor_vfx_mode = "pixiedust"