Chore: Redirect hot.opensauced.pizza links to explore page

[nickytonline]

We're going to archive https://github.com/open-sauced/hot, and redirect all traffic from hot.opensauced.pizza to the new explorer page.

Tasks:

• [x] #4142
• [ ] #4143
• [x] https://github.com/open-sauced/hot/pull/536

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