Add Recently Managed Instances to the Instances Dropdown

[RimiNosha]

Instances dropdown could contain shortcuts to like the last five or so last started or just managed in general instances.

I suppose a list of five configurable instances would also work, for those with workflows outside the norm, depends on what'd be easier.

[Cyberboss]

Posting since this isn't a priority for me. You'd basically keep a localStorage array of the last accessed instances, updating it whenever an instance route is accessed and populate the last 3 here