Support BlueSky Icon and Shortcode

[juliusdelta]

Simple Icons has a Bluesky icon (see: https://simpleicons.org/?q=bluesky). Since the platform appears to be gaining more ground, so it would be cool to add support for this natively. A Bluesky shortcode as well for https://docs.bsky.app/docs/advanced-guides/oembed

What do you think? I could open a PR that's alright.