feat: Add support for next_steps in front matter in PageGrid

[a-hariti]

Pre-merge checklist

If you work at Sentry, you're able to merge your own PR without review, but please don't unless there's a good reason.

• [ ] Checked Vercel preview for correctness, including links
• [ ] PR was reviewed and approved by any necessary SMEs
• [ ] PR was reviewed and approved by a member of the Sentry docs team

Description of changes

Closes #8093

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 27, 2024 2:17pm

[mjq-sentry]

Code-wise LGTM! Hopefully someone from the docs team can review the text changes (I'll add them as reviewers)

[getsantry[bot]]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you add the label WIP, I will leave it alone unless WIP is removed ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[codecov[bot]]

Bundle Report

Changes will increase total bundle size by 196 bytes :arrow_up:

Bundle name	Size	Change
sentry-docs-edge-server	427.92kB	3 bytes :arrow_down:
sentry-docs-client	5.77MB	6 bytes :arrow_down:
sentry-docs-server	7.15MB	205 bytes :arrow_up:

[a-hariti]

@stephanie-anderson 👀