imodel console embeds in docs site are broken

[MichaelBelousov]

https://www.itwinjs.org/learning/writeaconnector/#opensourcedata
On both chromium and firefox imodel console embeds are broken on the above page.

Firefox seems to imply that imodelconsole.bentley.com is using frame blocking headers. I assume those shouldn't apply to itwinjs.org

[ColinKerr]

We no longer support iframing iModel Console but we missed removing this link in the docs.

This PR removes the iframe and replaces with a link to iModel console and docs on how to execute a query programmatically. #8260

Thanks for reporting this.