Handle escaping special characters in the gollum filter

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The following discussion from !143654 (merged) should be addressed:

• @pslaughter started a discussion: (+3 comments)

  issue (minor): Since we are relying on some special characters here, is there a way we can reliably escape them?

  wiki_with_special_chars

  As-is, if a wiki page title contains | or ]] it doesn't behave as expected.