Remove color files & add additional completion sources

templates/nvim/lua/options.lua.j2

@@ -20,7 +20,7 @@ vim.o.hidden = true
 
 -- folding
 vim.o.foldmethod = 'expr'
-vim.o.foldexpr = 'nvim_treesitter#foldexpr()'
+vim.o.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
 
 -- don't open folds when jumping over one with (, {, [[ or [{
 vim.opt.foldopen = vim.opt.foldopen - { 'block' }