chore: Remove all mentions of Discord

[callahad]

We still love Discord, but it's not as relevant for our current focus.

[vercel[bot]]

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Name	Status	Preview	Updated
docs	✅ Ready (Inspect)	Visit Preview	Dec 2, 2022 at 3:18PM (UTC)

[github-actions[bot]]

4 total issues, 0 errors, and 4 warnings found for docs.suborbital.dev

Details

WARNING WCAG2AA.Principle1.Guideline1_3.1_3_1.H48 ```html

Skip to main content ``` This element has "position: fixed". This may require scrolling in two dimensions, which is considered a failure of this Success Criterion. ---
WARNING WCAG2AA.Principle1.Guideline1_4.1_4_3_F24.F24.FGColour ```html / ``` Check that this element has an inherited background colour or image to complement the corresponding inline foreground colour. ---
WARNING WCAG2AA.Principle1.Guideline1_4.1_4_3_F24.F24.FGColour ```html / ``` Check that this element has an inherited background colour or image to complement the corresponding inline foreground colour. ---

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