Add filter for unavailable instances

[FabioGentile]

Hello,

I think it could be useful to add a checkbox to hide the instances not available in the selected region. For example in the "newest" region a lot of old instances family are not available.

Thanks

[Criggie]

I came to make this same request. Turns out its a dupe of #134

[EverettBerry]

@FabioGentile @Criggie this is possible now that the column filters support regex. Let me know if we can close this out https://github.com/vantage-sh/ec2instances.info/issues/134#issuecomment-1399504899

[FabioGentile]

@EverettBerry thanks for the update! I think we can close this now