Replace nerdrtree with neotree

gui.vim

@@ -1,4 +1,4 @@
 set background=dark
 set termguicolors
 set t_Co=256
-colorscheme gloom-vim
+colorscheme shades_of_purple

keymap.vim

@@ -4,8 +4,8 @@
 noremap <F8> :bnext <CR>
 noremap <S-F8> :bprevious <CR>
 
-" Define a shortcut to turn on NERDTree
-map <C-n> :NERDTreeToggle <CR>
+" Define a shortcut to toggle the Neotree
+map <C-n> :NeoTreeShowToggle <CR>
 
 " Copy to clipboard with Ctrl+C when in visual mode
 vnoremap <C-c> "+y

plug.vim

@@ -1,11 +1,14 @@
 " Specify a directory for plugins
 call plug#begin(stdpath('data') . '/plugged')
 " Colourthemes
-Plug 'balanceiskey/gloom-vim'
+Plug 'Rigellute/shades-of-purple.vim'
 
 " Editor extensions
 Plug 'neomake/neomake'
-Plug 'preservim/nerdtree'
+Plug 'nvim-lua/plenary.nvim'
+Plug 'nvim-tree/nvim-web-devicons'
+Plug 'MunifTanjim/nui.nvim'
+Plug 'nvim-neo-tree/neo-tree.nvim'
 Plug 'zhaocai/timestamp.vim' 
 Plug 'vim-airline/vim-airline'
 Plug 'bling/vim-bufferline'