Develop

[ShaneIsrael]

This pull request updates documentation and code to clarify and expand supported video formats, improves user guidance, and makes minor logic enhancements. The most important changes are as follows:

Documentation improvements and user guidance:

• Added a "Supported Video Formats" section to README.md, listing supported containers (.mp4, .m4v, .mov, .webm) and codecs, and clarified that original files are always served directly.
• Expanded the "Transcoding (Optional)" section in README.md to explain how transcoding works and its effect on viewer experience.
• Updated contribution guidelines in README.md to discourage low-quality PRs and clarify the process, including a warning against unsolicited feature PRs.
• Corrected formatting in the feature list of README.md.

Supported file types:

• Added support for .m4v files in SUPPORTED_FILE_TYPES and SUPPORTED_FILE_EXTENSIONS in constants.py.

Logic and versioning updates:

• Improved logic in scan_video (CLI) to avoid duplicate VideoGameLink associations.
• Adjusted admin password warning logic to not show when LDAP is enabled in __init__.py.
• Bumped client and package versions to 1.6.12 in package.json and package-lock.json. [1] [2]