Add GitHub link

[jshbrntt]

I was frustrated that I could not easily navigate to the GitHub repository from the docs site so I've added the link to the navbar.

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed, please reply here (e.g. I signed it!) and we'll verify. Thanks.

---

• If you've already signed a CLA, it's possible we don't have your GitHub username or you're using a different email address. Check your existing CLA data and verify that your email is set on your git commits.
• If you signed the CLA as a corporation, please let us know the company's name.

[jshbrntt]

I signed it!

[googlebot]

CLAs look good, thanks!

[jelbourn]

Hi @synthecypher, sorry for the delay. Just a few comments on the PR.

[jelbourn]

Rather than using float, these should use flex stylings to put things on the left/right.

[jelbourn]

All of the css classes should be prefixed with docs-

[jelbourn]

Is the span necessary?

[jelbourn]

Looks like this SVG needs to be optimized (with a tool like svgo)

[googlebot]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.

[googlebot]

CLAs look good, thanks!

[jshbrntt]

@jelbourn Should have covered all your comments, please take another look.

[jelbourn]

LGTM