Consider making the website better suitable on mobile and small screens by implementing media queries

Originally created by @Anonymous on #13200 (Redmine)

We should spend some time on implementing more media queries into the CSS to make placements work more easily and provide better access to the menu/sidebar.

Feature Branch: tails:web/improve_mobile_layout

Related issues

Related to #13199 (closed)
Related to #7021 (closed)
Related to #7627 (closed)

Edited May 15, 2020 by Anonymous

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