Refactoring

[tiramisuse]

This is the first PR of what may be more, but broken up to give reviewers space. There's a few notable changes here, notable:

• Ditching of Webpack. Webpack would be valuable if this was using a framework around it, however packing makes development harder without the rest of the build and debug tooling that usually comes along. As it stands there are imports, which necessitates the need of a local web server due to browser security, one is provided via the Docker/Makefile but developers can use their own if they so desire.
• Yes there's a Dockerfile, but it's included only to make developer work easier for those who don't have their own way of setting up node. It's entirely optional to make changes, however it would make sense to use that environment for running tests, linting, etc.
• Linting and general code tidying up. I've opted for consistent semicolon use as ASI can introduce unexpected behaviour, and advise the project can use whichever style just remain consistent. Some commented out code pertaining to data models is untouched.

[tiramisuse]

What will be the next PR's once this is resolved?

• Further restructure of the code, so:
  • src/plot.js does no DOM manipulation or touching of global variables
  • src/core.js handles DOM interactions such as events and updates
  • src/presets.js also does no DOM manipulation directly

These should allow for easier changes and looser coupling of DOM to logic, and allow for models to be tested or used independently.

• Improvements to harm reduction aspects:
  • Target hormonal range displayed as graph overlay, including text
  • Discussion and removal of potentially harmful features (e.g. "speedrun" presets)
  • Updates to copy, tone, accessibility in page

These will make users better informed if they are using it for decision making.