Make it easier to find functions

[rbeyer]

The kalasiris package has lots of little functions that provide a more Pythonic handle for some ISIS activities (e.g. the Histogram class, fromlist, etc.), and it is difficult to find them in the documentation.

If you visit https://kalasiris.readthedocs.io/en/latest/modules.html you see a compact table-of-contents-like listing. However, if you click on any one of those to dive into the docs (e.g. https://kalasiris.readthedocs.io/en/latest/kalasiris.html), you loose that table-of-contents.

Describe the solution you'd like
Is there a way to get that table-of-contents in the left menu when you're on that page?