Load custom routes from theme folder

[starsinmypockets]

Allow themes to extend routes app routes.

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[anuveyatsu]

@starsinmypockets would it throw an error if you don't have routes.js module in your template? E.g, opendk and eds themes don't need custom routes.

[starsinmypockets]

Yes, for this implementation the theme would need a stub. I think this is not a bad pattern since the default theme template could include the placeholder which would serve as a guide for devs... We could add a try / catch that throws an error explaining that this file is required... or a warning..

[starsinmypockets]

(If this is approved I can add test coverage)

[starsinmypockets]

Closed. This will be picked up in this epic:
#22