Update the pyansys template

[clatapie]

📝 Description of the feature

There are a few sections of the template ansys-template that can be updated:

• Remove the requirements folder and add the requirements in pyproject.toml.
• Modify README.rst instructions to use python -e .[doc,tests]
• Remove the possibility to support Python 3.7 to follow FEAT: Dropping Python 3.7 support pyansys#228.
• Add an AUTHORS.md file
• Revisit the conf.py file and align to latest ansys-sphinx-theme
• Enable dependabot for the template dependencies (if possible somehow)
• Fix the package/library naming since it is confusing for the users and naming is performed oddly.

💡 Steps for implementing the feature

No response

🔗 Useful links and references

No response

[RobPasMue]

Thanks for opening this issue @clatapie - adding a couple of new items to the description