Plugin and Theme discovery ready

[EstebanForge]

Now, pretty much every core feature to handle plugins and themes is ready.

Index json schema is kind of finalized. So we can start extending the index.

Pending features here.

Will tackle this next, in the following order:

• config/options page for UnrePress
• improve documentation at the wiki
• unrepress main site, for plugins and themes search, discovery and submission. Also to provide UnrePress download for everyone else.

After that, the remaining features will follow.

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This discussion was created from the release Plugin and Theme discovery ready.