Improve information about the level of support of extensions

Hi,

+1 for 1, 2, 3 and 4 with the same notice to have the possibility to review globally (since we have a lot of extensions now)

For the backward compatibility I think we need the possibility to define the plan(s) that will be assigned for the old “recommended” notion (some plans might not cover all the current recommended list).

Thank you for all the work!