Improve meta tags for better linking experience

[with-heart]

Currently missing an image. Description might be better if it had something brand-related and exciting to draw people in, at least for the index page?

[with-heart]

Related inspiration here: https://github.com/statelyai/xstate/issues/3672

[laurakalbag]

@with-heart thank you for the feedback! I’ve got this on my list of todos, and you’ve pushed it right to the top of the list!