Related Sites: Improve the default results.

[StevenDufresne]

Sometimes the JetPack related sites API doesn't find any related sites to show and we handle that case by showing sites from the featured category. See code.

I think that's a good start but we can do better. It shortens the user journey and potentially traps them in loops and users also see the same exact 3 suggestions.

I noticed it by looking at the following sites:

• https://wordpress.org/showcase/usain-bolt/
• https://wordpress.org/showcase/rafael-nadal/

Both those show the same default featured sites that feel pretty out of context.

Suggestion:

• Try to choose from the same category.
  • If there aren't enough, take from the featured category.
• Make it random.