Add vimtex plugin

lua/custom/plugins/vimtex.lua

@@ -0,0 +1,10 @@
+return {
+  'lervag/vimtex',
+  lazy = false, -- we don't want to lazy load VimTeX
+  init = function()
+    vim.g.vimtex_view_method = 'skim'
+
+    vim.g.vimtex_syntax_enabled = 0
+    -- vim.g.vimtex_compiler_method = "latexmk"
+  end,
+}