Add Caddyfile syntax highlighting (#536)

Author: vjik

src/.vitepress/config.js

@@ -1,5 +1,8 @@
 import taskLists from 'markdown-it-task-lists'
 
+// Based on https://github.com/caddyserver/vscode-caddyfile (MIT), with fixes for placeholders, IPv6 and global options
+import caddyfileGrammar from './grammars/caddyfile.tmLanguage.json'
+
 let currentYear = new Date().getFullYear();
 
 export default {
@@ -26,6 +29,7 @@ export default {
         ]
     },
     markdown: {
+        languages: [{...caddyfileGrammar, name: 'caddyfile', aliases: ['caddy']}],
         config: (md) => {
             md.use(taskLists)
         }

src/.vitepress/grammars/caddyfile.LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Matthew Penner
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.