Standardize Naming Conventions and Enhance Documentation

[ppant]

This PR standardizes the repository's naming conventions and improves its documentation.

Key changes:

• Naming Standardization: All directories and Python scripts have been renamed to follow a consistent PascalCase convention, improving maintainability and professional appearance.
• Typo Fixes: Corrected typos in several filenames (e.g., BalanceParenthlessCheckImple.py to BalanceParenthesesCheckImple.py).
• Enhanced Documentation:
  • Updated the root README.md and all subdirectory README.md files with corrected internal links.
  • Added Big O complexity analysis using LaTeX notation for each implementation in the READMEs.
  • Restructured the project overview in the root README.
• Code Refactoring: Updated SinglyLinkedListCycleCheckImple.py to define cycle_check as a proper instance method using self, fixing a non-idiomatic implementation.
• Complexity Corrections: Updated Shell Sort's complexity to $O(n^2)$ to accurately reflect its worst-case performance.

All 50 scripts were verified to execute without errors using a bash-based test loop.

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PR created automatically by Jules for task 11846920040852816040 started by @ppant

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