Add probability of OR notebook

[Haleshot]

📝 Summary

Used the Probability of OR chapter as the base reference to get a good interactive notebook running. Good examples with relevant LaTeX text and python functions.

📋 Checklist

• I have included package dependencies in the notebook file using --sandbox
• If adding a course, include a README.md
• Keep language direct and simple.

[Haleshot]

Been facing issues with --sandbox and uvx marimo edit for a while now.
Always seem to run into this error:

[W 250212 22:00:30 sandbox:120] Failed to read dependencies from .\03_probability_of_or.py

Finally resulting in:

File "C:\Python311\Lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in position 9101: character maps to <undefined>

Will inline the dependencies manually for now?

[akshayka]

This is fantastic! Tiny comments. Great work. I like the balance of clear exposition, code examples, and a compelling interactive lesson (venn diagrams). Minor suggestion, use width medium so the venn diagram example is more legible?