Fix: add site title, author, and description to layouts

[yosevu]

• Add site-title site-author, and site-desc to layouts public-api
• Update default layout
• Update head partial
• Update meta data table docs
• Make meta charset casing consistent with other attributes

Hey @teesloane, I noticed that there is no site title or meta author and description. Can they be added for SEO and accessibility?

https://developer.mozilla.org/en-US/docs/Learn/HTML/Introduction_to_HTML/The_head_metadata_in_HTML#Adding_an_author_and_description

I haven't been able to get my development env working yet with GraalVM to test these changes, but I wanted to check first before I go any further in case you had other plans.

[yosevu]

A couple questions @teesloane:

• Are only required config properties being checked in layout_test.clj?
• Are there any guidelines for commit style? It looks like you are using something similar to conventional commits.

[teesloane]

A couple questions @teesloane:

* Are only required config properties being checked in [layout_test.clj](https://github.com/theiceshelf/firn/blob/master/clojure/test/firn/layout_test.clj#L13)?

Nah, I kind of forgot about that test. It's a bit flimsy. I think I made it to make sure that config property names aren't being overwritten or removed. You can either add the new keys or leave it for a better test in the future.

* Are there any guidelines for commit style? It looks like you are using something similar to [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/).

I've actually just borrowed my commit leaders from here — and didn't know about conventional commits. Going forward (if not now, then at least at first major release) I think this might be a good choice.

[yosevu]

Updated to correctly get user config values and I'm able to verify it now:

I can clean up and squash my commits if everything else looks good @teesloane.

[yosevu]

I did run into an issue with a circular dependency in org.clj. This looks like a bug to me, but I wanted to check first to see if you are running into it too @teesloane:

[teesloane]

Looks good! As for the circular dependency - you are requiring firn.org from within firn.org on line 7. I guess it can still compile in that case? Either way, better to remove it. It looks like I can squash and merge into master from Github, but feel free to rebase and clean commits as you like.

[yosevu]

I squashed my commits. The circular dependency comment was unrelated to this PR. I thought it would be better to create a separate one to remove it: https://github.com/theiceshelf/firn/pull/42.

[teesloane]

Thanks! Merged both!