Update URL to Frogbot documentation

[Nicolas-M]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• This pull request is on the dev branch.
• I used gofmt for formatting the code before submitting the pull request.
• Update documentation about new features / new supported technologies

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• Replace the old gitbook-based documentation with a link to JFrog's official docs for Frogbot.
• This saves users a click as the old URL would bring them to a page noting that the docs had a new home.

[github-actions]

All contributors have signed the CLA ✍️ ✅
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[Nicolas-M]

I have read the CLA Document and I hereby sign the CLA

[github-actions]

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