ctapipe.io sidebar links same(?) pages twice

[Tobychev]

Describe the bug
The sidebar menu for ctapipe.io contains repeated entries, for example TableReader. It looks like there's some automatic namespace processing that goes wrong.

To Reproduce
Go to https://ctapipe.readthedocs.io/en/latest/api/ctapipe.io.tableio.TableReader.html and compare it with
https://ctapipe.readthedocs.io/en/latest/api/ctapipe.io.TableReader.html

Expected behaviour
That there should only be one entry per module, or if there are several modules with the same name that they should be in separate sections also in the sidebar.

[maxnoe]

This is because we include multiple modules on the same page of the documentation.
This means that the original definition of a class (e.g. ctapipe.io.tableloader.TableLoader and the user facing export (e.g. ctapipe.io.TableLoader) are rendered twice.

A solution would be to copy the hierarchy of the modules in the documentation pages and not include tableloader in io