If toctree is inside a section, the subtree is inside the section too.
We don't want all of dev/* to be under "Mailing list".
I have not found a decent workaround for this. The toplevel toctree
avoids this purely by the fact that it is the topmost toctree. Right
now that means you should 1) avoid having more than a few paragraphs of
text before the toctree for that subtree (put most of the content after
the toctree; clumsy if the toctree is long), or 2) put the toptree
immediately after the document title, make it :hidden:, and let the
reader use links in the text or the ToC in the sidebar to navigate.
See start/index for an example of this.
Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>