Add our product page to header

[skoech]

Description

The docs starter pack gives us an option to include our product page in the header of of our docs site. We agreed as a team to point to microceph.com because it's more of a homepage, and it's suitable for a broader audience - including for marketing reasons, which are not satisfied by our docs site.

Type of change

• Documentation update (change to documentation only)

How has this been tested?

• I have built the docs locally to make sure it works.

Contributor checklist

• [x] self-reviewed the code in this PR
• [ ] added code comments, particularly in less straightforward areas
• [ ] checked and added or updated relevant documentation
• [ ] checked and added or updated relevant release notes
• [ ] added tests to verify effectiveness of this change