Add talkpython HTMX + Django training

[luzfcb]

Description

Add a link to the HTMX + Django: Modern Python Web Apps, Hold the JavaScript Course

Corresponding issue: fix #3322

Testing

Do not apply

Checklist

• [x] I have read the contribution guidelines
• [x] I have targeted this PR against the correct branch (master for website changes, dev for source changes)
• [x] This is either a bugfix, a documentation update, or a new feature that has been explicitly approved via an issue
• [ ] I ran the test suite locally (npm run test) and verified that it succeeded