Unhide hamburger button and try to make it accessible

[oferb]

[oferb]

Consider using Eilana's website example:
https://adn-accesstime.com/

[S0AndS0]

The jekyll/minima theme has a mobile friendly menu that doesn't require any JavaScript, here's an old PR that also resolves collapsing the menu when a client clicks anywhere outside of an opened menu...

jekyll/minima#405