Document header ids

[samajammin]

Is your feature request related to a problem? Please describe.

We don't have any documentation on how or why we use header ids in markdown files.

Describe the solution you'd like

Create a page in our GH docs explaining

• why their important (consistent anchor links across languages, calculating translation status of pages)
• how they're generated (i.e. manually or using the script)

Describe alternatives you've considered

None

Additional context

Some issues & PRs with historical context:

• Support explicit heading IDs #272
• Support explicit heading IDs [Fixes #272] #369
• Support new content version release in codebase #4441

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[github-actions]

This issue is stale because it has been open 45 days with no activity.

[corwintines]

While the process has changed slightly with the migration to NextJS, we should still create this documentation. Going to remove stale and assign to @wackerow and @corwintines to get it done.