Add denols to nvim

In Deno projects `tsserver` is less than ideal. This PR starts `denols`
instead of `tsserver` if `nvim` finds the `NVIM_USE_DENOLS` variable
when reading the lsp config.

modules/terminal-life/nvim/lsp.vim

@@ -79,6 +79,8 @@ lua <<EOF
   -- vscode HTML lsp needs this https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#html
   capabilities.textDocument.completion.completionItem.snippetSupport = true
 
+  local use_denols_for_typescript = not(os.getenv('NVIM_USE_DENOLS') == nil)
+
   for lsp_key, lsp_settings in pairs({
         'bashls', ------------------------------- Bash
         'ccls', --------------------------------- C / C++ / Objective-C
@@ -120,7 +122,13 @@ lua <<EOF
         ['terraformls'] = { --------------------- Terraform
             ['filetypes'] = { "terraform", "hcl", "tf" }
         },
-        'tsserver', ----------------------------- Typescript / JavaScript
+
+        -- The TS/JS server is chosen depending on an environment variable,
+        -- since denols is nicer for Deno based projects
+        ------------------------ Deno TS/JS
+        ------------------------------------ Typescript / JavaScript
+        (use_denols_for_typescript and 'denols' or 'tsserver'),
+
         'vuels', -------------------------------- Vue
         'svelte', ------------------------------- Svelte
         ['yamlls'] = { -------------------------- YAML
@@ -204,6 +212,11 @@ lua <<EOF
     },
   }
 
+  -- https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md#denols
+  vim.g.markdown_fenced_languages = {
+    "ts=typescript"
+  }
+
   -- Configure diagnostics
   vim.diagnostic.config({
     virtual_text = false,