Right TOC should not resize

The right nav should wrap each heading. Right now, the right nav changes size for each topic, based on the length of the widest heading.

For example, as you click through the docs, the TOC seems to "jump":

Instead, the words should wrap and the column/nav area should be fixed-width. Something more like this (which is more like how it used to be, I think):

Side note: When you resize the page, the text does seem to wrap. This arrow points to the continuation of the heading:

However, you can't really differentiate between topics because the padding is the same between each line. When a topic wraps, the padding should be more like this very sad mockup:

To summarize:

This issue is to make the right pane fixed-width and to update the padding so each heading is discernible/obvious.