Add use cases in Dev-Docs

Borreguero Calvo, Joserequested to merge
usecases into next

To Test:

Run the following commands in the terminal. Skip the first if you already created the webrefl conda environment

make conda
conda activate webrefl
make devdocs

After this, point the browser to file://(path to my web_reflectivity repo)/dev-docs/_build/html/usecases/index.html and inspect the two use cases A Manual Fit Session and Fitting auto-reduced data.

Edited by Borreguero Calvo, Jose

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