Improve support for pages without sections (titles)

Is your feature request related to a problem? Please describe. Pages that don't have any section seems to be hard to work with. Also, their HTML <title> looks odd (in the browser tabs for example). Currently, a page that doesn't have any section (with for example html_title set to 'test') will render <no title> — test.

Also it seems like the document can't be included in any toctree, even explicitly (using Title <test_doc>).

Describe the solution you'd like

• Ability to remove the <no title> — part so my page title is equal to html_title (for example in conf.py).
• Allow to explicitly reference documents that have no sections in a toctree.

Describe alternatives you've considered I've tried patching it manually, without great success.