Remove old Discord bot code

[tannerlinsley]

Remove the unused discord-bot directory containing the old Discord bot implementation that is no longer needed.

[netlify]

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Lighthouse	1 paths audited Performance: 16 (🔴 down 4 from production) Accessibility: 90 (no change from production) Best Practices: 83 (no change from production) SEO: 98 (no change from production) PWA: 70 (no change from production) View the detailed breakdown and full score reports

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