Added FFmpeg cheat sheet for video automation

[peternaf]

Summary by Sourcery

Documentation:

• Add rendi-api/ffmpeg-cheatsheet entry to the Awesome Video README

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates README.md by inserting a new FFmpeg cheat sheet link, correcting list formatting in the video tools section, and removing a redundant contributor instruction at the end of the file.

File-Level Changes

Change	Details	Files
Added FFmpeg cheat sheet link under video automation tools	Inserted new bullet for rendi-api/ffmpeg-cheatsheet Ensured proper emoji and description formatting	README.md
Corrected list formatting for existing video-thumbnail-generator entry	Removed stray leading dash before the flavioribeiro/video-thumbnail-generator item Standardized bullet indentation	README.md
Removed outdated contributor guidelines note	Deleted the ‘Please take a quick look at the contribution guidelines…’ line Removed trailing newline at end of file	README.md

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[sourcery-ai]

Hey @peternaf - I've reviewed your changes and they look great!

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