Use GitHub Discussions for feature requests

[delucis]

What kind of changes does this PR include?

• Something else!

Description

• Converts the Feature Request issue template into a template for the Feature Requests category in Discussions
• Updates our new issue config so it links to discussions for feature requests

[changeset-bot]

⚠️ No Changeset found

Latest commit: 451289f

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[astrobot-houston]

size-limit report 📦

Path	Size
/index.html	5.13 KB (0%)
/_astro/*.js	19.27 KB (0%)
/_astro/*.css	9.63 KB (0%)

[HiDeoo]

I don't think there is a way to properly check out the form before this is merged, but from the docs, this looks good to me.