Make a hosts folder for system and home, remove legacy.nix cause I never used it, change some comments

home/utils/neovim.nix

@@ -27,6 +27,13 @@
       # Hex color visualizer and color theme
       nvim-colorizer-lua
       vim-monokai-pro
+
+      # Discord RPC
+      vimsence
+
+      # Nerdtree
+      nerdtree
+      vim-nerdtree-syntax-highlight
     ];
     extraConfig = ''
       lua <<EOF
@@ -96,6 +103,7 @@
       nmap <C-x> :bnext<CR>
       nmap <C-z> :bprev<CR>
       nmap <C-w> :bd<CR>
+      nmap <C-a> :NERDTreeToggle
     '';
   };
 }