Clarify how devDependencies should be used for NPM packages (OEP-67: Standard Tools and Technologies)

[bradenmacdonald]

Per a discussion with @regisb about how we can speed up MFE build times in Tutor, I want to clarify how dependencies and devDependencies should be used. The goal is that tutor can install MFE dependencies using npm ci --production which would do a fast install that excludes devDependencies. This will be a significant speedup in the case where we can exclude things like Jest (which is a very large and bloated package[^1]) that aren't needed just to build and deploy the MFE.

Note: this is very much not the case now:

• frontend-build includes Jest, eslint, TypeScript, react-dev-utils, and more in dependencies, and puts @babel/preset-typescript which I think is required for build in devDependencies
• course-authoring MFE puts frontend-build and axios as devDependencies
• The learning MFE puts frontend-build as a devDependency
• The learner-dashboard MFE puts jest, @testing-library/user-event, and redux-devtools-extension as dependencies while putting @openedx/frontend-build as a devDependency

[^1]: npx howfat jest says 487 deps, 49.6mb

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