I did a small SEO check on the website and nothing big showed up, but some things should be pretty feasible to implement, making it easier to crawl without confusion and some changes to the titles. I noticed as well, that all pages have no description, this will lower the CTR in search results because search engines need to come up with one by themselves and that looks mostly random like that:

To Do (most I can do myself, but descriptions and homepage title I can't provide):
I did a small SEO check on the website and nothing big showed up, but some things should be pretty feasible to implement, making it easier to crawl without confusion and some changes to the titles. I noticed as well, that all pages have no description, this will lower the CTR in search results because search engines need to come up with one by themselves and that looks mostly random like that:

To Do (most I can do myself, but descriptions and homepage title I can't provide):
Set self-referencing absolute canonicals, so we do not have duplicate content as the page is reachable vie the github and mozilla subdomain
Switch title-schema and set "- Mozilla IoT" at the end of the title, not at the beginning, the document name and title is more important, than the general website name
The homepage should have a more speaking title as well
Ad a meta description for all pages with min 100 and max 160 characters
fix nav-links to include trailing slash, so no redirect is triggered