revert: feat: styled error screen (#8930)

packages/backend/src/server/web/views/base.pug

@@ -53,7 +53,7 @@ html
 		block meta
 
 		block og
-			meta(property='og:title'       content= title || 'Misskey')
+			meta(property='og:title'       content= title || 'Misskey') 
 			meta(property='og:description' content= desc || '✨🌎✨ A interplanetary communication platform ✨🚀✨') 
 			meta(property='og:image'       content= img)
 

packages/backend/src/server/web/views/flush.pug

@@ -1,12 +1,6 @@
 doctype html
 
 html
-	head
-		meta(charset='utf-8')
-		meta(name='application-name' content='Misskey')
-		title Flushing Misskey
-		style
-			include ../error.css
 	#msg
 	script.
 		const msg = document.getElementById('msg');