Updated URLs and removed the videos from this directory since they're…

[gregwhitworth]

It updates the video paths to the CDN, and I removed the video folder from the repo since they're now on the CDN.

What this PR does

Requirements

• [ x] My PR follows all applicable accessibility requirements (See .github/ACCESSIBILITY_REQS.md).
• [x ] My PR follows the CSS code style guidelines (See .github/CSS_STYLE_REQS.md).
• [x ] I have linted my code using npm run lint:css -- demoDirectoryName/**/*.css and npm run lint:js -- demoDirectoryName/**/*.js, and have fixed the errors.