488: Restructure static files

[afuetterer]

Proposed changes

This PR introduces the following changes to the code base.

• remove static/ from version control
• remove ddionrails-visualization from dependencies
• add d3.js to dependencies
• move static assets from static/src/ to assets/ directory
• update webpack.config.js
• build multiple webpack bundles

Related issues:

• Include topic_list.js in webpack #371
• Move render.js from ddionrails-visualization into this project #483
• Restructure static files #488

Types of changes

• Bugfix (non-breaking change which fixes an issue)

Checklist

• Pytest passes locally with my changes

Further comments

@hansendx: It works on my machine. But I doubt this set up is conforms to any best practices of web development.

It feels wrong to do stuff like this:

import { basketButton } from "./basket_button.js";
window.basketButton = basketButton;

But I could not access lots of functions without "glueing" them to window.

[codecov]

Codecov Report

Merging #520 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop    #520   +/-   ##
=======================================
  Coverage     62.2%   62.2%           
=======================================
  Files           70      70           
  Lines         3646    3646           
  Branches       366     366           
=======================================
  Hits          2268    2268           
  Misses        1336    1336           
  Partials        42      42

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