Clean out backlog of pull requests

It doesn't look like there's a currently open issue for this, so:

Can something be done about the (as of writing) 553 currently open pull requests? A very large number either add features that have already been added, or can no longer be merged in without significant revisions. Clearing this backlog would make merging and organizing future PR's much easier.

I'll be flagging PR's that should be closed for attention, but I think that a maintainer of the website should go through the PR's to resolve this problem.

まず、リポジトリで現在オープンになっている pull request と、issue で候補としてフラグ付けされているものを確認します。既存の機能と重複する変更や、大幅な修正が必要な変更を特定し、その後、Web サイトのメンテナーと連携して、それらをクローズまたは解決します。バックログを体系的に確認し、古くなった pull request に対応できれば完了です。