Include Tutorials and Docs

[kalebphipps]

Description

This PR includes tutorials and updated documentation. Specifically:

• Ensures all docstrings are informative, fixing #73
• Ensures the Optional type hint is used consistently, fixing #66
• Agree on convention for type hints without full import path, closing #60
• Docs should now be complete, fixing #48 #49 and #50
• Also, the issue causing problems when install artist has been solved fixing #72

Type of change

Please delete options that are not relevant.

• [X] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [X] This change requires a documentation update

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing tests pass locally with my changes
• [X] Any dependent changes have been merged and published in downstream modules

[kalebphipps]

Update:

• Link to readthedocs also included

[kalebphipps]

Thanks for the comments! I have gone through the suggestions and accepted all or made comments when necessary. In general:

• We now use imperative clauses everywhere.
• The docstrings are necessary due to the way sphinx compiles the API reference. I have described this in more detail in the comments above.
• I adapted the style for the links in the documentation.
• I tried to use American English, even if that goes against every one of my natural instincts :)
• I adapted the headers in the NURBS tutorial to be in title case.

I'll merge and close the PR with these changes in a minute!