Develop upgrade css

[fernandossmm]

• Theme switch fixed, changed some icons and minor text to be clearer.
• Notifications changed to use info instead of warnings.
• Drop zones updated, default route image updated.
• Icon popup messages fixed to show what they actually do.
• Multiple member images changed.
• Starting video now adapts its size to window.

[codecov[bot]]

Codecov Report

Merging #225 into develop will decrease coverage by 0.11%. The diff coverage is 22.22%.

@@             Coverage Diff             @@
##           develop     #225      +/-   ##
===========================================
- Coverage    49.33%   49.22%   -0.12%     
===========================================
  Files           63       63              
  Lines          904      902       -2     
  Branches        95       95              
===========================================
- Hits           446      444       -2     
  Misses         403      403              
  Partials        55       55              

Impacted Files	Coverage Δ
src/App.js	7.69% <ø> (ø)
src/components/generic_components/BurgerMenu.js	50.00% <ø> (ø)
src/components/generic_components/Card.js	100.00% <ø> (ø)
...rc/components/generic_components/FloatingButton.js	46.66% <0.00%> (+2.91%)	:arrow_up:
...mponents/generic_components/InfiniteScrollImage.js	50.00% <ø> (ø)
...mponents/generic_components/InfiniteScrollVideo.js	50.00% <ø> (ø)
src/components/generic_components/ThemeSwitch.js	80.00% <ø> (ø)
src/components/login/Login.js	42.62% <ø> (-0.93%)	:arrow_down:
src/components/pages/AboutPage.js	90.00% <ø> (ø)
src/components/pages/FriendGroupsPage.js	47.36% <ø> (-2.64%)	:arrow_down:
... and 7 more

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