Improve usability of header on mobile devices
Closes #762 (closed)
Previous behaviour
Steps to reproduce:
- Use the site on a small mobile device
- Header sticks to the top
- Breaking of header buttons to next line
New behaviour
Steps to validate that it works:
- Use the site on a small mobile device
- Header now doesn't stick to the top, only on desktop
- Breaking of header buttons to next line is fixed