Docs: add carbonate system tutorial

[NikhilDhruv]

Changes:

1. Title changed to pyeql_tutorial_carbonate.ipynb

2. tutorial.md updated.

[NikhilDhruv]

Feel free to close the prior pull request (#203). This is the updated version. Let me know if any more changes need to be made!

[rkingsbury]

Thank you @NikhilDhruv !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.70%. Comparing base (2771d91) to head (9eabea0).
Report is 9 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (2771d91) and HEAD (9eabea0). Click for more details.

HEAD has 19 uploads less than BASE

Flag	BASE (2771d91)	HEAD (9eabea0)
	21	2

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #204      +/-   ##
==========================================
- Coverage   81.79%   75.70%   -6.10%     
==========================================
  Files           9        9              
  Lines        1494     1494              
  Branches      256      256              
==========================================
- Hits         1222     1131      -91     
- Misses        226      317      +91     
  Partials       46       46              

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