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.

[fernandossmm]

Closes #144

[codecov[bot]]

Codecov Report

Merging #206 into master will increase coverage by 17.27%. The diff coverage is 28.70%.

@@             Coverage Diff             @@
##           master     #206       +/-   ##
===========================================
+ Coverage   32.16%   49.44%   +17.27%     
===========================================
  Files          82       63       -19     
  Lines        1312      898      -414     
  Branches      128       94       -34     
===========================================
+ Hits          422      444       +22     
+ Misses        803      400      -403     
+ Partials       87       54       -33     

Impacted Files	Coverage Δ
src/App.js	7.69% <ø> (+2.93%)	:arrow_up:
src/FriendGroupManager/CreateFriendGroup.js	55.17% <0.00%> (+44.45%)	:arrow_up:
src/components/generic_components/BurgerMenu.js	50.00% <ø> (ø)
...rc/components/generic_components/FloatingButton.js	46.66% <0.00%> (ø)
...mponents/generic_components/InfiniteScrollImage.js	50.00% <0.00%> (+5.55%)	:arrow_up:
...mponents/generic_components/InfiniteScrollVideo.js	50.00% <0.00%> (+5.55%)	:arrow_up:
src/components/generic_components/ThemeSwitch.js	80.00% <ø> (ø)
src/components/pages/AboutPage.js	90.00% <ø> (ø)
src/components/pages/CreateFriendGroupPage.js	44.44% <ø> (+34.44%)	:arrow_up:
src/components/pages/FriendGroupsPage.js	47.36% <ø> (+42.60%)	:arrow_up:
... and 46 more

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