Update README removing invalid operators

[Victorcorcos]

Summary

• Fix Markdown table formatting for Logical OR and Bitwise OR operators
• Remove non-existent "Logical NOT" operator from the operators table

Details

This PR addresses formatting issues in the README's operators table:

1. Removed Logical NOT operator: This operator was listed in the table but doesn't exist in the library's implementation.
2. Fixed Logical OR operator display: Changed from plain text a || b to HTML entity encoding <code>a &#124;&#124; b</code> to prevent Markdown table parsing issues
3. Fixed Bitwise OR operator display: Changed from plain text a | b to HTML entity encoding <code>a &#124; b</code> to prevent Markdown table cell separation issues