feat: add sitemap to www

[flagrede]

Description

Closes: #2187

• bump next to v14.0.1
• add /sitemap.xml endpoint
• fix type errors

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1. https://deploy-preview-2202--regen-website.netlify.app/sitemap.xml

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[flagrede]

@aaronc here's the sitemap https://deploy-preview-2202--regen-website.netlify.app/sitemap.xml
Let me know if some values need to be changed, wasn't sure about priority and update frequency.

[aaronc]

Thanks @flagrede. I would set the change frequency to daily across the board. Yearly is way too infrequent. Even if we don't change things too often currently, we should plan on having more frequent updates eventually