[fix bug 899554] Adding style to hide back to top button by default.
[fix bug 895852] Make persona icon crisp.
[fix bug 895374] Fix dropdown menu/tabzilla overlap.
[fix bug 901743] Fixes text overlap on mobile on homepage.
Merge pull request #565 from glogiotatidis/mergetry

Playdoh + tests + bugfixes!
Merge branch 'fixhappyforms'
fix middleware classes
background index_all_profiles on deploy
fix INSTALLED_APPS
remove broken settings from base.py