Webpack Refactor

[sernst]

Convert the notebook web subproject into a webpack-managed application
from a gulp managed one.

[codecov]

Codecov Report

Merging #61 into master will decrease coverage by 0.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage    98.3%   98.19%   -0.12%     
==========================================
  Files         226      226              
  Lines        9880     9880              
==========================================
- Hits         9713     9702      -11     
- Misses        167      178      +11

Impacted Files	Coverage Δ
...ron/session/writing/components/shared_component.py	52% <0%> (-44%)	⬇️

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[coveralls]

Coverage decreased (-0.1%) to 98.198% when pulling aa06be0 on webpack-refactor into 0322a75 on master.