add a TOC to support-hero.md

[slshults]

Changes

Adding a table of contents to the support hero page. It's getting a bit lengthy.

Less scrolling, more reading...

note: the link to How do I handle a bug report or feature request? will work after PR 8845 is merged

Checklist

• [✅] Words are spelled using American English
• [✅] Titles are in sentence case
• [✅] Feature names are in sentence case too
• [✅] Use relative URLs for internal links

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Name	Status	Preview	Updated (UTC)
posthog	✅ Ready (Inspect)	Visit Preview	Jun 28, 2024 2:43am

[slshults]

Just noticed we already have this in the rightside panel, 🤦, so closing this PR from the department of redundancy department.