[nvim] Don't install Treesitter on Windows

nvim/dotfiles/plugins-list.vim

@@ -22,9 +22,11 @@ let s:plug = funcref('dotfiles#plugman#register')
   call s:plug('alaviss/nim.nvim')
   call s:plug('stevearc/vim-arduino')
   call s:plug('xiyaowong/coc-nvim-lua')
-  call s:plug('nvim-neorg/neorg', { 'branch': 'unstable' }) " dependencies {{{
-    call s:plug('nvim-treesitter/nvim-treesitter', { 'do': ':TSUpdate' })
-  " }}}
+  if has('unix')
+    call s:plug('nvim-neorg/neorg', { 'branch': 'unstable' }) " dependencies {{{
+      call s:plug('nvim-treesitter/nvim-treesitter', { 'do': ':TSUpdate' })
+    " }}}
+  endif
   call s:plug('noahfrederick/vim-laravel') " dependencies {{{
     call s:plug('noahfrederick/vim-composer')
     call s:plug('tpope/vim-projectionist')

nvim/plugin/neorg.lua

@@ -1,4 +1,5 @@
-local neorg = require('neorg')
+local ok, neorg = pcall(require, 'neorg')
+if not ok then return end;
 
 local ok, cmp = pcall(require, 'cmp')
 if not ok then return end;

nvim/plugin/treesitter.lua

@@ -1,4 +1,7 @@
-local parser_configs = require('nvim-treesitter.parsers').get_parser_configs()
+local ok, parser_configs = pcall(require, 'nvim-treesitter.parsers')
+if not ok then return end
+
+local parser_configs = parser_configs.get_parser_configs()
 
 parser_configs.norg = {
     install_info = {