Fix for readthedocs

[tmorrell]

❤️ Thank you for your contribution!

Description

Readthedocs doesn't install the package by default, so it needs to be added to the config.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings.
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• I've NOT included third-party code (copy/pasted source code or new dependencies).
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[fenekku]

That works. A squash and merge since final change so succinct 😉