[Gutenberg] Mobile styling of “Activity” and “Popular” blocks.

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[Gutenberg] As a visitor on mobile, I should have CSS styling of the “activity” and “popular” blocks as matched with the designs to have a matched experience to desktop visitors. AC1. The “Activity” (Browse by activity) and “Popular” (Top Adventures) blocks simply scroll horizontally in mobile displays. They don’t match the Figma design, though they do match the AMP Start Firebase site. Please style these on mobile like the Figma designs. AC2. Please update their styling in the Gutenberg editor to match the new responsive styling on the front-end.

Related #12. (See mockups and other general layout notes there.) See these in deployment here: http://dev-amp-start-travel.pantheonsite.io/

As requested by @kienstra

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@kienstra asks: @mehigh, would you be available to work on this?

[kienstra]

Hi @mehigh, Would you be available to work on this? Thanks a lot for your work with this theme.

[mehigh]

Yepp, I can and I will.