User profile/progress page

There needs to be a page accessible from the menu that gives an overview of the user's progress. For now it can just display how far they got on each page, which is all the information we have. That would already be helpful for a request made in #216:

> One thing I would like to see is some sort of evidence of completion or at least which was the last module completed so my students can prove their progress.

When I asked via email what it would mean to 'prove' progress since futurecoder lets anyone look at solutions, they said:

> I normally use a LinkedIn Learning Python course because our university had a free license but has now been cancelled. I would require them to provide the certificate of completion and the solved exercise file. I knew they could watch the course on 2X speed and find the completed solution file, but at least I'd provided them some free learning resource so when they were working with Python code later I could say "remember the video told you to indent for loops, or use semicolons" yada yada. Could you have something that would print out the modules that were completed? I would suggest they create an account anyway. If they wanted to take the time to cheat the system that's their loss.

Beyond that, having such a page would be the first step to handling #85 and/or #90.