fix: enable markdown processing in center tags and disable directory urls for V2 to resolve image rendering issues

docs/api.md

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     <iframe width="560" height="315" src="https://www.youtube.com/embed/yWzKJPw_VzM" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 
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 	[![top 10 api testing tools](images/summarising_top_10_api_testing_tools.png){: style="width:50%"}](https://blog.testproject.io/2020/06/25/top-10-api-testing-tools-to-watch-in-2020/)
 
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 <details>
   <summary>Click to expand!</summary>
 
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 <blockquote class="twitter-tweet"><p lang="en" dir="ltr">People complain about tooling fatigue but web dev in 2021 is 10x simpler than in 2011. You just gotta pick the right tools.<br><br>Infra: <a href="https://twitter.com/PulumiCorp?ref_src=twsrc%5Etfw">@PulumiCorp</a> <br>Data: <a href="https://twitter.com/PostgreSQL?ref_src=twsrc%5Etfw">@PostgreSQL</a> <br>API: <a href="https://twitter.com/HasuraHQ?ref_src=twsrc%5Etfw">@HasuraHQ</a> <br>Frontend: <a href="https://twitter.com/vercel?ref_src=twsrc%5Etfw">@vercel</a>&#39;s NextJS<br><br>And no proprietary bullshit—100% open source!</p>&mdash; gunar.uk (@gunar) <a href="https://twitter.com/gunar/status/1395744592071323651?ref_src=twsrc%5Etfw">May 21, 2021</a></blockquote> <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>