Update Time Travel layout

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[lovethebomb]

Looks super neat!

I've proposed three changes on my fork if you want to review them!

Layout

• Add a media query at min-width: 60rem to split layout vertically first, then horizontally

On Exit Button

• Remove obsolete onClick and id, just use href="{{.Site.BaseURL}}" directly
• Increase width/height of the SVG, add a bit of padding when in smaller screen layout

I've just increased the button size a bit, but best practices tells that on smaller layout, 44px should be the minimum size for elements with finger interactions.

It would just require to move things around a bit, but I wanted to read what were your thoughts first :)

[plainspace]

@lovethebomb I cherry-picked those commits and made a couple of others. What do you think?

[lovethebomb]

I've added comments but LGTM otherwise 👍 !