DOC: How to install docs dependencies and build documentation with poetry

[melissawm]

Issue with current documentation:

There's no details on installing the documentation dependencies such as sphinx and the pydata-sphinx-theme in the development docs.

Idea or request for content:

Add page describing how to build the docs locally.

[Kai-Striega]

I've been holding off on writing this due to some complications in the interaction with Poetry and the current makefile we have set up.

Poetry has the concept of a dependency group. This means we can install the doc group with poetry install --with docs. However the makefile is still set to run with pip. The makefile should be edited to work with Poetry before we document how to set up the docs.