[Proposal]: Update documentation with a containerized application example (most likely the "help/" section)

[alessio-locatelli]

Issue guidelines

• I've read the Issue Guidelines and wholeheartedly agree.

Issue Checklist

• I have searched open or closed issues and found nothing related to my idea.
• I have read the Documentation and it doesn't mention anything about my idea.
• To my best knowledge, my idea wouldn't break something for other users.

Describe your Idea

To-do:

• In the docs/help/camgear_ex.md add a link to the ReconnectingCamGear because the second example is battle-tested and can be used as is.
• Add a link to the vidgear containerized demo project somewhere in the documentation. Add a small note that the code provided can be used as a starting point for beginners, or if someone doubts that a bug is related to the system packages, to compare the behaviour inside a Docker container.

Use Cases

• A consistent, reproducible environment that people can use to verify possible bugs or try out the code without being overwhelmed by system-specific problems like different versions of ffmpeg and other system packages.
• An additional example for beginners.