Combine artifacts into a single release zip

[Dewb]

What does this PR do?

Further tweaks the artifact production process in Actions to include the HTML docs and also combine everything into a release .zip with the firmware update scripts.

Provide links to any related discussion on lines.

How should this be manually tested?

Any background context you want to provide?

If the related Github issues aren't referenced in your commits, please link to them here.

I have,

• n/a updated CHANGELOG.md and whats_new.md
• n/a updated the documentation
• n/a updated help_mode.c (if applicable)

[Dewb]

Example artifacts output: https://github.com/monome/teletype/actions/runs/7469102257