Add nested albums info

[ildyria]

Fixes #71

[meichthys]

I would prefer to include an "x" in the json file and display an ❌ for this feature on each project that doesn't support it.

[ildyria]

I would prefer to include an "x" in the json file and display an ❌ for this feature on each project that doesn't support it.

It does not display X ?
If so then that is a mistake from my side. I will fix the script !

[ildyria]

It does display x (if not provided). :)

[meichthys]

I haven't been able to test the generated file yet, but the json should also show an "x" for each project that doesn't support the feature, or as an alternative, i suppose we could remove all the key/values from the json where the value is an 'x'.