Merge upstream branch, fix linting of md files and disable prettier t…

[Smita81]

…o prevent clash with ESLint rules (HackYourFutureBelgium#16)

• just-enough-dom refactor, moving away from dom-io library. and more examples of multiple interactions

• update study configs for multiple interactions

• more READMEs, some more DOM IO, a formatting run (sorry!)

• switch shift/unshift

• linting fixed and prettier disabled to prevent eslint rule clash

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