Use ${XDG_CACHE_HOME}/nvim/tree-sitter for treesitter parser caching.

.config/nvim/lua/plugin/nvim-treesitter.lua

@@ -7,6 +7,7 @@ return { {
 	config = function()
 		-- Pre-install a few languages we're (very) likely going to use
 		local ts = require('nvim-treesitter')
+		ts.setup({ install_dir = vim.fn.stdpath('cache') .. '/tree-sitter' })
 		ts.install({
 			'c', 'make',
 			'bash', 'gitignore', 'editorconfig',