Mobile view of user guide is widened by tables

[TWiStErRob]

Steps to reproduce

1. Grab your phone
2. Go to https://docs.junit.org/current/user-guide/
3. Swipe left

Expected: nothing happened
Actual: lots of white space to the right

Context

The home page works ok. There are some tables in the user guide that widen the page. I think those should be in a container as wide as the page and scroll internally maybe?

If you zoom out, you can see the problem:

One	Two

Deliverables

• user guide has no extra space on the right, 100% of the content is taking up the screen