HG-332 Linked images

Handle images that link to other articles.

Related Wikia/app change: https://github.com/Wikia/app/pull/5340

https://wikia-inc.atlassian.net/browse/HG-332
From what i remember we don't have to explicitly name the type when we assign an obvious value right away @kenkouot  @hakubo @aquilax but this is rather not an issue ;)