Things like About, FAQ, TOS and such could be displayed when clicking in an icon on the bottom of the sidebar (like the tiny keyboard there), since they’re not really content-focused (and the visible part of the sidebar should in my opinion be completely focused on providing easy access to “featured” content). Right now is a bit hard to find and not entirely logical.
Ah, I came here to mention the same. My first impression about the sidebar is very positive, but it is also my first impression that these two links should remain visible by default, since both are targeted to newcomers.
About and FAQ have been at the bottom of the hamburger menu since forever in Discourse. Has this been a concern for users in all this time? If not, they could be kept at the bottom of the new sidebar. There is no lack of vertical space, especially for newcomers (who will have a shorter sidebar).