Feature proposal: Add API Blueprint rendering
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=14187) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=14187) </details> <!--IssueSummary end--> API Blueprint (https://apiblueprint.org/) is a markdown-like language for describing APIs. The documentation is often part of the repository in form of a .apib file. Gitlab could render it, same as it renders .md files. This is from the deprecated feedback forum: http://feedback.gitlab.com/forums/176466-general/suggestions/10271382-add-api-blueprint-rendering
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