So far, the Tobiko docs were duplicated in some places, different
(although duplicated), and some fragments were not relevant (or
outdated).
This patch refactors the configuration part of Tobiko quick start guide
by modularizing the fragments ("spilling" fragments instead of coping
them), correcting typos, and deleting/updating irrelevant information.
Note: in order to see how the change will appear, download it with
`git review -d <change_url>`, run the `tox -e docs` command, and then
double click
(with the file explorer) tobiko/doc/build/html/<file-you-want>.
Change-Id: Ibb27382ec3c7a8969686cfd89c2205cdd2dd2525
5cd15560e4