Update roadmap 2021-2022

Content request

✏ Suggest ideas for new content!

Checklist

• This issue is not a duplicate, I've searched the Issue Tracker
• This issue is not a question, I'm aware that I can submit questions via Mastodon, Twitter, Email, Reddit or Matrix
• This issue is a content request, and not a bug report, feature request, or anything other

What are you missing or what could be improved?

Roadmap is outdated.

What is the solution you'd like to see?

Update roadmap section to reflect most recent plans for 2021-2022 period.

Do you have additional comments?

N/A