[ringneighbors] Add new extractor

[Tatsh]

Before submitting a pull request make sure you have:

• At least skimmed through adding new extractor tutorial and youtube-dl coding conventions sections
• Searched the bugtracker for similar pull requests
• Checked the code with flake8

In order to be accepted and merged into youtube-dl each piece of code must be in public domain or released under Unlicense. Check one of the following options:

• I am the original author of this code and I am willing to release it under Unlicense
• I am not the original author of this code but it is in public domain or released under Unlicense (provide reliable evidence)

What is the purpose of your pull request?

• Bug fix
• Improvement
• New extractor
• New feature

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Description of your pull request and other information

These are links shared from the Ring app, within the Neighbors section. A typical shared link looks like:

Just saw this on Neighbors: https://neighbors.ring.com/n/kKq7G

Only sometimes the page provides a thumbnail.

[Tatsh]

Bump

[Tatsh]

@dstftw If you want me to make changes, I'll need to re-make this PR. I asked GitHub and they cannot fix branch references.