Clean up obsolete/deprecated component.

[midori0507]

• Delete navbar, sidebar, side-navbar which was replaced by new component but not getting removed after that. They're not getting imported anywhere in the code also.
• Bonus: small tweak for label coloring so text can be easier to see

[codecov-io]

Codecov Report

Merging #900 into develop will increase coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #900      +/-   ##
===========================================
+ Coverage    91.63%   91.67%   +0.04%     
===========================================
  Files          218      213       -5     
  Lines         2846     2800      -46     
  Branches       501      493       -8     
===========================================
- Hits          2608     2567      -41     
+ Misses         210      205       -5     
  Partials        28       28

Impacted Files	Coverage Δ
app/shared/top-navbar/TopNavbar.js	50% <ø> (ø)	⬆️

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