[ACT-122] Remove view component support / ably-ui gem

[dpiatek]

Jira Ticket Link / Motivation

https://ably.atlassian.net/browse/ACT-122

This is the next step after https://github.com/ably/website/pull/5800. We remove all VW components, leaving the preview app, deployment and other tooling intact.

With these changes in, the preview app (and possibly also our cypress setup) could get removed too, and Storybook added (which I've started in #302).

Note there are 2 components which don't have JSX component and yet are still here:

• CompanyAutocomplete
• FeatureFooter

They provide CSS/JS that is still used in the website repo.

EDIT (jamiehenson - 11/3/24):
CompanyAutocomplete and FeatureFooter assets now removed from ably-ui, and moved to website via this PR.

Summary of changes

See commits for details.

I've taken some shortcuts, assuming the preview app is on it's way out:

• some tests are flaky, notable ones around hover, which Cypress is notoriously bad add. I've just commented these out. I think tests should be re-written in the framework Storbybook provides
• I've copied some images that were previously fetched from the gem into the preview app. This is just for showcasing purposes so should not matter.

How do you manually test this?

Head over to the review app and click around!

Reviewer Tasks (optional)

Merge/Deploy Checklist

• Written automated tests for implemented features/fixed bugs
• Rebased and squashed commits
• Commits have clear descriptions of their changes
• Checked for any performance regressions

Frontend Checklist

• No frontend changes in this PR
• Added before/after screenshots for changes
• Tested on different platforms/browsers with Browserstack
• Compared with the initial design / our brand guidelines
• Checked the code for accessibility issues (VoiceOver User Guide)?

[jamiehenson]

@kennethkalmer @denissellu I've migrated the two components Dominik mentioned in the PR description away into website vis this PR so it's ready for a re-review - I've checked over the rest of the PR and it seems sane.

[kennethkalmer]

Really nice to see this step change in the project!