we have no linting configuration (ESLint proposal)

[tukib]

Problem

We have no linting configuration for our code editors and github workflows to use. This means that bad patterns may be uncaught even after code review.

Context

Configuring ESLint would solve the lack of linting configuration, and mitigate bad patterns in our code.

• Add ESLint as a dev dependency and any necessary eslint plugins (e.g. @docusaurus/eslint-plugin)
• Use the recommended configuration for @docusaurus/eslint-plugin
• Modify the lint script in package.json to use ESLint as well - may be redundant, check if building docusaurus runs ESLint.

Fine tuning the specific ESLint rules will be done in a separate issue, as they will need further discussion and are beyond the scope of an initial configuration.

[tukib]

We have yet to encounter a strong need for this, so we'll pick this up later if the need arises.