Competition html/markdown pages

[ihsaan-ullah]

It seems the documentation pages in these 2 competitions are broken

https://www.codabench.org/competitions/476/

https://www.codabench.org/competitions/562/

[Didayolo]

I guess it is linked to this problem and recent changes:

• Can't mix Markdown and HTML #879

For the Cross-Domain MetaDL challenge, I think I converted the pages to Markdown, but some special tags may break it. You can see that the tab "Data" is working well.

[ihsaan-ullah]

@Didayolo i think this is fixed by #1090