Refactor project_presenter and stat_anchor_list to be more semantic

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The following discussion from gitlab-ce!20934 should be addressed:

• @smcgivern started a discussion: (+4 comments)

We currently set link: nil with enabled: true to project_presenter.rb which is then used by _stat_anchor_list.html.haml to render links.

We should be more semantic and perhaps use a visible property instead of enabled, and render either a link or plain-text in the HAML template, depending on whether a link is supplied or not.