Out-of-date README and missing file contents

[rolyp]

• [x] yarn build-tests $\to$ yarn build
• [x] yarn tests $\to$ yarn test
• [x] yarn tests-browser $\to$ yarn test-browser
• [x] Delete app-tests instruction
• [x] Extract artefact-related notes to icfp2024-artefact.md
• Fix code toggles (check in Chrome)
  • [x] Undo commented code in App.purs
  • [x] bar-chart.fld and line-chart.fld still not loaded
  • [x] renewables.fld not loaded
  • [x] Replace prettyprinted views by file views
• [x] Check in Safari

From @RaoOfPhysics:

I am running Kubuntu 23.10, for info. I started off by installing yarn and got v1.22.19 to work. I cloned the fluid repo, cd’d into it and ran yarn install. Everything seemed fine. I then tried running yarn build-tests, yarn tests, yarn build-app-tests and yarn app-tests, all of which said the respective commands weren’t found. I decided to skip the tests and run yarn serve-app. First error I got was that npx wasn’t found on my system. It isn’t listed as a requirement. So I installed npm and then ran npm install -g npx. It then gave me an error saying html-serve couldn’t be installed, so I installed it manually with npm install -g html-serve. After this, running yarn serve-app worked and I finally got it in the browser (Firefox).

Also:

None of the toggles show anything.

[RaoOfPhysics]

Thanks, Roly! Will create an issue next time!