Final Developer Portal Design Review

Bugs from the various parallel workstreams to check on at the end.

[ ] The mobile view menu icon has disappeared. It is still there as I can click on it, but I cannot see it anymore.
[ ] Sometimes the close mobile menu icon is disappearing. Example in #40 on the new /docs page it disappears
[ ] Footer bar at top of footer should not be 100%
[ ] Double check that the developer portal button should have the active state
[ ] Double check font sizes
[x] Footer is not centered
[x] Footer links to Terms of Conditions which is not a thing or a page.

frequency-chain / frequency-xyz