Various optimizations and miscellaneous

[mithi]

• Remove unused static images
• Update manifest ( better icons )
• Update colors
• Remove react markdown dependency
• Bump plotly to latest version
• Display animated gif before loading plot

[codecov[bot]]

Codecov Report

Merging #132 into master will increase coverage by 0.09%. The diff coverage is 90.90%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   75.65%   75.75%   +0.09%     
==========================================
  Files          57       58       +1     
  Lines        1442     1452      +10     
  Branches      177      178       +1     
==========================================
+ Hits         1091     1100       +9     
- Misses        305      306       +1     
  Partials       46       46              

Impacted Files	Coverage Δ
src/App.js	100.00% <ø> (ø)
src/components/generic/SmallWidgets.js	90.90% <ø> (ø)
src/components/pages/LandingPage.js	100.00% <ø> (ø)
src/index.js	0.00% <0.00%> (ø)
src/components/HexapodPlot.js	88.88% <100.00%> (+8.88%)	:arrow_up:
src/components/pages/MinimumRandomRobotGif.js	100.00% <100.00%> (ø)
src/components/pages/PoseTable.js	100.00% <100.00%> (ø)
src/components/pages/RandomRobotGif.js	100.00% <100.00%> (ø)
src/templates/plotParams.js	100.00% <100.00%> (ø)

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