feat(frontmatter): Document required vs. optional frontmatter

[janpio]

See https://prisma-company.slack.com/archives/C5Z9TH6N9/p1686763363942739

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 15, 2023 8:38am

[github-actions]

This PR changes the following pages (Vercel Preview Deploy links):

Changed Vercel links

• /docs/about/prisma-docs/docs-components/frontmatter (currently)

(Note that links will only be valid after Vercel preview deploy succeeded)

[github-actions]

This PR probably requires the following redirects to be added to vercel.json:

• This PR does not change any pages in a way that would require a redirect.

[meletj]

Overall LGTM. I'll let Nilu take a second look too.
I think we could adjust this to use 'you' instead of 'we' . If we wish, we can make the metaTitle more descriptive than the title.

[janpio]

Unfortunately seems that the frontmatter page was changed too much so there is now a conflict. This will need to be re-applied to the current state @nilubava, @carlagn, @meletj.

[nikolasburk]

Yeah, I tried to go through it in the web editor but wasn't able to properly resolve everything. Let's defer 🙏

[janpio]

Reordering is almost impossible to get right here in the GitHub UI. I think someone will need to look at the preview of this, resort the current state of the frontmatter page, and then add the same headlines as here.