Feature/switch mobile desktop

[ghalestrilo]

Fixes #1524

This PR integrates mobile and desktop views under the same URLs, updating required redirects on mobile. A quick research indicates that 770px is currently a good breakpoint for rendering mobile (which matches my previous experience with responsive layouts).

I have verified that this pull request:

• has no linting errors (npm run lint)
• is from a uniquely-named feature branch and has been rebased on top of the latest master. (If I was asked to make more changes, I have made sure to rebase onto master then too)
• is descriptively named and links to an issue number, i.e. Fixes #123

[catarak]

This is working great for me! Would it be possible to still render the desktop view if MOBILE_ENABLED is false? I'd like to be able to deploy the editor without mobile being enabled until we make sure that the basic user flows work.

[ghalestrilo]

Great point, I'll make sure it works. I'm also working to make the desktop version renderable on mobile if the user prefers.

[ghalestrilo]

Done. You can now:

• Control Mobile display with the MOBILE_ENABLED flag
• Force desktop version to render by clicking ••• > Original Editor

I was thinking: In the future, users may (?) want to

• Force mobile view: this can be done by creating a new action and updating the utils/responsive#mobileFirst method
• Store their preference. No idea how to do this 🤷🏻

But I don't think these are priorities right now

[catarak]

Working great for me ✨