caddy: add homedir snippet

etc/caddy/snippets.caddyfile

@@ -4,6 +4,18 @@
     header @origin Access-Control-Request-Method GET
 }
 
+(homedir) {
+    @user_home path_regexp user ^/~([^/]+)(/.*)?$
+    handle @user_home {
+        redir /~{re.user.1} /~{re.user.1}/ permanent
+        root * {args.0}{re.user.1}/WWW
+        rewrite * {re.user.2}
+        file_server browse {
+            hide .[A-Za-z]*
+        }
+    }
+}
+
 (nobots) {
     respond /robots.txt 200 {
         body "User-agent: *