Mastodonのリンクの所有者認証に対応 (#5161)

* Profile metadata を設定できるように

* API desc

src/server/web/views/base.pug

@@ -44,3 +44,4 @@ html
 			<svg viewBox="0 0 50 50">
 				<path fill=#fb4e4e d="M25.251,6.461c-10.318,0-18.683,8.365-18.683,18.683h4.068c0-8.071,6.543-14.615,14.615-14.615V6.461z" />
 			</svg>
+		block content

src/server/web/views/user.pug

@@ -36,3 +36,8 @@ block meta
 		link(rel='alternate' href=user.uri type='application/activity+json')
 	if profile.url
 		link(rel='alternate' href=profile.url type='text/html')
+
+block content
+	div#me
+		each m in me
+			a(rel='me' href=`${m}`) #{m}