Logo does not link to homepage

[jpanther]

When using the logo option, it should link back to the site home.

Discussed in #12

^{Originally posted by myriahnottage October 19, 2021}
I want to implement the logo option that renders in the top left such that it's clickable and will return users to the home page. I'm not seeing an href in the header.html partial, but I'm happy to add one if others would find it useful.

Thanks!