Fix build error, update css paths, bump versions, update readme

[mithi]

• Regenerate requirement.txt as the current one is producing an build error.
• Point to new external stylesheets as codepen is apparently not letting us access the old one anymore (the new one is now store in github pages)
• Move some information from the README to WIKI
• Bump versions or numpy, plotly dash, and plotly dash daq
• Fix new code style errors detected by flake8 and pylint

[codeclimate]

Code Climate has analyzed commit 4d0bdb0 and detected 0 issues on this pull request.

View more on Code Climate.

[codecov]

Codecov Report

Merging #111 (4d0bdb0) into master (e131f17) will not change coverage.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           master     #111   +/-   ##
=======================================
  Coverage   62.66%   62.66%           
=======================================
  Files          30       30           
  Lines        1856     1856           
=======================================
  Hits         1163     1163           
  Misses        693      693           

Impacted Files	Coverage Δ
hexapod/ik_solver/helpers.py	36.36% <0.00%> (ø)
pages/helpers.py	37.20% <100.00%> (ø)
style_settings.py	63.15% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d4a9f7b...4d0bdb0. Read the comment docs.