Add Bluesky to website footer

[genevievecory]

Sorry, I've forgotten how to do branches 🤦

criticalmaps.github.io/_includes/footer.html

Line 33 in 3e12fd0

<a href="https://mastodon.social/@criticalmaps" target="_blank" rel="noopener noreferrer" title="Visit Critical Maps on Mastodon (opens in new tab)" aria-label="Critical Maps on Mastodon">Mastodon</a>

https://bsky.app/profile/criticalmaps.bsky.social

(Germany loves Mastodon, but the rest of the world not so much! I personally hate it. 🤮 Constantly logging into different servers, constantly authenticating, constantly not seeing the posts from the other servers, blah. I use it in the browser, not the app, so that I can zoom in on the tiny text. /rant)