Highlight and incentivize apps with more complete metadata

[AlexanderPico]

In order to incentivize app authors to complete as many fields as possible we might consider adding badges with progress bars (e.g., 75% tasks completed to achieve badge X). These badges would also highlight to users which apps are better annotated, etc.

We already have some badges. Some are manually set and some are driven by fields. But we might need a more advanced badge system to manage progress. See for example, https://github.com/jiaaro/django-badges