OGP向けにインスタンスのバナー画像を提供するように

src/server/web/views/base.pug

@@ -0,0 +1,44 @@
+block vars
+
+doctype html
+
+!= '\n<!-- Thank you for using Misskey! @syuilo -->\n'
+
+html
+
+	head
+		meta(charset='utf-8')
+		meta(name='application-name' content='Misskey')
+		meta(name='referrer' content='origin')
+		meta(property='og:site_name' content='Misskey')
+		link(rel='manifest' href='/manifest.json')
+
+		title
+			block title
+				| Misskey
+
+		block desc
+			meta(name='description' content='A planet of fediverse')
+
+		block meta
+
+		block og
+			meta(property='og:image' content=img)
+
+		style
+			include ./../../../../built/client/assets/init.css
+		script
+			include ./../../../../built/client/assets/boot.js
+
+		script
+			include ./../../../../built/client/assets/safe.js
+
+	body
+		noscript: p
+			| JavaScriptを有効にしてください
+			br
+			| Please turn on your JavaScript
+		div#ini.
+			<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>

src/server/web/views/note.pug

@@ -1,4 +1,4 @@
-extends ../../../../src/client/app/base
+extends ./base
 
 block vars
 	- const user = note.user;
@@ -11,14 +11,16 @@ block title
 block desc
 	meta(name='description' content= summary)
 
-block meta
-	meta(name='twitter:card'       content='summary')
+block og
 	meta(property='og:type'        content='article')
 	meta(property='og:title'       content= title)
 	meta(property='og:description' content= summary)
 	meta(property='og:url'         content= url)
 	meta(property='og:image'       content= user.avatarUrl)
 
+block meta
+	meta(name='twitter:card' content='summary')
+
 	if note.prev
 		link(rel='prev' href=`${config.url}/notes/${note.prev}`)
 	if note.next

src/server/web/views/user.pug

@@ -1,4 +1,4 @@
-extends ../../../../src/client/app/base
+extends ./base
 
 block vars
 	- const title = user.name ? `${user.name} (@${user.username})` : `@${user.username}`;
@@ -11,14 +11,16 @@ block title
 block desc
 	meta(name='description' content= user.description)
 
-block meta
-	meta(name='twitter:card'       content='summary')
+block og
 	meta(property='og:type'        content='blog')
 	meta(property='og:title'       content= title)
 	meta(property='og:description' content= user.description)
 	meta(property='og:url'         content= url)
 	meta(property='og:image'       content= img)
-	
+
+block meta
+	meta(name='twitter:card' content='summary')
+
 	if !user.host
 		link(rel='alternate' href=`${config.url}/users/${user._id}` type='application/activity+json')
 	if user.uri