Add feb and mar 2022 workshops

[raynamharris]

PR Checklist

• [x] Release label added
• [ ] PR category label added
• [ ] PR mergeable
• [ ] Clean build logs
• [ ] Linked related issues
• [ ] Colorblindness test https://www.toptal.com/designers/colorfilter/

PR Description

Updates the list of past workshops to include the rest of the hackathon workshops and the march training events.

Preview link Add the RTD auto generated preview link

Review format

spell check please

Timeline

april 15 release

[github-actions[bot]]

Reviewer Checklist

• [ ] spelling and grammar
• [ ] successful run of all installation and code chunks
• [ ] sufficient explanation and details for the tutorial content
• [ ] code syntax and naming convention
• [ ] adherence of tutorial format to style guide
• [ ] functional links (inter and intra)
• [ ] accessible hyperlink text