Add json schema video presentation

[ryngpt]

Description

Adds a JSON Schema presentation to the Awesome JSON Schema resources.

• Presentation video is available through the LinkedIn post.
• The accompanying slide deck is linked in the post comments.
• Added the resource under the Videos category.
• Updated the generated README.md.

Validation

• npm test — passes
• npm run lint — attempted; ShellCheck reports CRLF line-ending errors in the existing .github/no-staged-uncommitted-files.sh file on Windows.

[cla-assistant]

All committers have signed the CLA.

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[jviotti]

Thanks a lot!