Custom overrides for plugin information

[saadbruno]

As discussed in Discord, would be cool if developers could submit custom information to the plugins site along with their repo, to allow manual overrides of plugin title, image and set a direct link to the plugin JS file.

There's a few ways we could do it. We could have a login system with user accounts, so they could register and edit their own plugins. I'm not really a fan of this idea.

Another way we can do it (thanks to Oli414 for the suggestion) is to allow plugin owners to have a file in their repo with information we can use. I think we go with this one.

So we need to:

• Choose a markup language
• Choose a file name
• Implement all the code and DB changes to make it happen