Fix https-invalid landing page URL link in README (#6860)
Fix https-invalid landing page URL link in README (#6860)

The URL connectedhomeip.com currently redirects to buildwithmatter.com, but with invalid HTTPS certificate configuration.

In order to avoid the user facing the browser HTTPS security blockage, therefore questioning the validity of this whole repo, using directly the future URL buildwithmatter.com in README.
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