add how-to-delete-groups to support hero handbook page

[slshults]

Changes

Adding instructions on how to delete groups to support hero (at the bottom o' the page), to prevent searching for a needle in a haySlack.

Checklist

• [✅] Words are spelled using American English
• [✅] Titles are in sentence case
• [✅] Feature names are in sentence case too

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Name	Status	Preview	Updated (UTC)
posthog	✅ Ready (Inspect)	Visit Preview	Jun 19, 2024 10:13pm