Apps card style updates, instructions for empty states, and loading circle flickering fix

[Charlesthebird]

This PR:

• Updates the logic for showing instructions to the user when their Portal is set to private and they are logged out.
• Updates the API details page to always show the docs tab, and adds in instructions to that tab if there are no docs for that API Product version.
• Updates the landing pages so that they don't flicker (this mainly happened on the API's landing page). Was fixed by relying on the data instead of the loading property that SWR returns.
• Updates the apps cards to look more like the teams cards. This was done because I got the feedback that the apps don't need images, so I decided to standardize them.

Here are some screenshots of the new UX improvements and teams cards updates.

BOT NOTES:
resolves https://github.com/solo-io/solo-projects/issues/6853
resolves https://github.com/solo-io/solo-projects/issues/6852
resolves https://github.com/solo-io/solo-projects/issues/6851
resolves https://github.com/solo-io/solo-projects/issues/6854

[solo-changelog-bot]

Issues linked to changelog:
https://github.com/solo-io/solo-projects/issues/6853
https://github.com/solo-io/solo-projects/issues/6852
https://github.com/solo-io/solo-projects/issues/6851

[solo-changelog-bot]

Issues linked to changelog:
https://github.com/solo-io/solo-projects/issues/6853
https://github.com/solo-io/solo-projects/issues/6852
https://github.com/solo-io/solo-projects/issues/6851
https://github.com/solo-io/solo-projects/issues/6854