added release notes for december

[s-canchi]

PR Checklist

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

PR Description

Added the latest release notes for Dec 2021

Preview link https://cfde-training-and-engagement--482.com.readthedocs.build

Review format

Directly or in comments

Timeline

This week (Dec 6th)

[github-actions[bot]]

Reviewer Checklist

• [x] 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)
• [x] accessible hyperlink text