Make all handbook tables fixed width

What is current bug behavior

Tables are making the handbook pages too wide on mobile. See #5600 (closed) for details.

Fix

Make all tables have fixed width. This will prevent the scrolling, but will cause wrapping of the text.

NOTE: It looks like there were previously may have been more sophisticated fixes for this, such as the .table-responsive class, but it doesn't look like this is used any longer, and it would be a more involved fix to apply

Related issues

Closes #5600 (closed)