Move tutorials to top level

[nwlandry]

This PR uses nbsphinx-link to move the tutorials back to the top level so that not only can nbsphinx render the notebooks for the website, but users can easily access the notebooks as well. This PR also fixes a few small extraneous things, namely:

• Now the encapsulation_dag page has the correct name
• We no longer use pkg_resources to determine the version and the contributing guide now reflects that.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.35%. Comparing base (8ab20d8) to head (6dc809e).
Report is 31 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #550      +/-   ##
==========================================
- Coverage   92.35%   92.35%   -0.01%     
==========================================
  Files          60       60              
  Lines        4500     4499       -1     
==========================================
- Hits         4156     4155       -1     
  Misses        344      344              

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[thomasrobiglio]

great, thank you @nwlandry

[nwlandry]

Thanks for the review, @thomasrobiglio! :D