Same visual style for challenges #33
Description
Currently on the site, the challenges sections are formatted slightly differently.
They use both ordered and unordered lists:
The spheres tutorial uses an ordered list
- Challenge 1 ...
- Challenge 2 ...
The data reduction tutorial uses an unordered list
- Challenge 1 ...
- Challenge 2 ...
I suggest we use a unordered list, and bold letters for the Challenge x, like in the proteins tutorial
- Challenge 1 ...
- Challenge 2 ...