clarify compatibility of extension

luceos

In some circumstances we need to clarify the compatibility of an extension with Flarum. Eg the current premium extension backup is only available for the upcoming 0.1.0-beta.8 of Flarum. It is listed as extension, but will fail to download for two reasons; being premium and not being compatible with beta 7.

Aside from showing a compatibility table in the extension view page, it would be wise to show a clear warning when extensions are only available from upcoming releases on.

luceos

The extension pages now feature a version table. The next step would be to add additional clarifications about compatibility (or perhaps only incompatibility) with the current version.

We could consider adding a label or status icon that is transparent on both flagrow.io and bazaar.