docs should include that sphinx_book_theme is required

[goekce]

Description / Summary

Without html_theme = 'sphinx_book_theme' in conf.py the exercise and solutions lack the icons on the top left side. It would be great if this theme is recommended in https://ebp-sphinx-exercise.readthedocs.io/en/latest/index.html#sphinx-project

To see the issue use the default theme html_theme = 'alabaster'

Value / benefit

People who are new to this project would spend less time for debugging :)

Implementation details

No response

Tasks to complete

No response

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[mmcky]

thanks @goekce -- sorry this took me so long to get to.

I have now added this to the docs and opened #52