Bring the roadmap up to date with what has shipped

[sivert-io]

The roadmap page still listed a lot of shipped work as planned. Each item here was checked against the site's releases.ts.

• Now marked done: threads, pinned messages, folders with permissions, per-channel permissions, forum channels, group DMs, friends, blocking, member cards, game activity / Rich Presence, plugins, two-factor sign-in, phone push, and per-channel notification levels.
• Added: MLS-encrypted DMs, device linking, contact settings, the Discord history import (the import bot and bridge are in progress), the spam filter, role and channel mentions, the Watch button for screen shares, and video sized to what viewers draw.
• Phone apps: marked as in testing. Microsoft Store is done, the Mac App Store is in progress.
• Still planned: slow mode, message search, GIFs, polls, events, encrypted private channels, the Rich Presence SDK.
• The intro now says when the page was last checked.

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