[doc] fix warnings/errors in doc build
- fix links to images
- fix a couple of typos
- re-add IDownloadableOneLineView doc
- rename documenting.rst back to .txt, it's intended as a doc of how to
write rst, not part of the rst doc
Related to #4832808
.. _ajax:
Ajax
----
CubicWeb provides a few helpers to facilitate *javascript <-> python* communications.
You can, for instance, register some python functions that will become
callable from javascript through ajax calls. All the ajax URLs are handled
by the :class:`cubicweb.web.views.ajaxcontroller.AjaxController` controller.
.. automodule:: cubicweb.web.views.ajaxcontroller