Separate out the "Submitting your work" section into its own "Submitting code" page (worded that way to ensure no confusion between submitting work to a code repository and submitting work to OnTrack, and to be clear that this is about code and not Figma files, data, etc)
Add pre-PR steps to the new "Submitting code" page, particularly about the new project structure check
Tweak some links and headings
Add missing date+author info
Rename the Packaging Pull Requests file, because with the spaces linking to it didn't work.