[navigability] Link to GH Pages from the repo's About section

[hunterloftis]

We should link to https://w3c.github.io/webcomponents-cg/ from here:

... and probably also from the README.

[thescientist13]

Did we also want to deploy that TPAC 2021 report to a "sub" URL (instead of owning the whole TLD), ex:
https://w3c.github.io/webcomponents-cg/tpac-2021

[Westbrook]

I've added the link. I do want to have a landing page that links through to this report so we can support more and different reports in the future, but don't really have the time right now. I anyone wants to hop on the, I'd be quite excited to see it!

[thescientist13]

Cool, I'll make an issue and see if I can put something together over the next few days.