Fix #387: Add support for showing concept cards in explorations [BLOCKED ON MISSING TESTS] #422
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Fix #387.
This introduces support for showing custom Oppia concept card links in feedback and content HTML. This requires a custom content handler with some hacky tag injection, but this seems like the best we can do (see https://stackoverflow.com/a/36528149 for context).
This updates the 'meaning of equal parts' exploration to include this new tag. This isn't yet finished on Oppia backend (FYI @aks681), so what we're working with in the meantime is a tag of the sort: refresher lesson.
This PR is ready for review, but not submission yet since tests need to be written.