Invalid Demo video links

[anilsenay]

Required check list:

• I didn't find in the repository's issues section a similar bug.
• I understand, this is an Open Source and not-for-profit product.
• This is not about a third-party project, framework, or technology.

Describe the bug:

Demo video links in README and Wiki, which uploaded to recordit.co, are invalid. Probably their domain expired. You might update those links.

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