Update READMEs and standardize project structure to PascalCase

[ppant]

I have performed a comprehensive overhaul of the repository's documentation and organization. This included:

1. Renaming: Standardized all directories (e.g., ErrorHandling, Deque) and Python files (primarily in Arrays/ and Trees/) to follow a consistent PascalCase convention.
2. Subdirectory READMEs: Updated every major subdirectory to have its own README.md with a '## Contents' section, including technical descriptions and LaTeX complexity analysis for each script.
3. Root README: Reorganized the main README.md to reflect the new structure. I fixed the Table of Contents anchor links to use correct GitHub-style slugs for headings with emojis.
4. Complexity Analysis: Added Big O time and/or space complexity for all 50 algorithms throughout the documentation.
5. Verification: Confirmed that all 49 non-interactive Python scripts execute successfully with the new naming scheme.
6. Copyright: Updated the copyright notice to cover the year 2026.

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PR created automatically by Jules for task 12266542583011115326 started by @ppant

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