add latex hot reload and lsp support

lua/plugins/latex.lua

@@ -0,0 +1,13 @@
+-- defines latex plugins, EXCEPT the lsp (defined in lsp.)
+
+return {
+  {
+    "lervag/vimtex",
+    ft = { "tex", "latex", "bib" },
+    -- tag = "v2.15", -- uncomment to pin to a specific release
+    init = function()
+      -- VimTeX configuration goes here
+      vim.g.vimtex_view_method = "skim"
+    end,
+  },
+}