Support base URL using request headers

[fmvilas]

Support customization of the base URL using headers like Playground does here: https://github.com/asyncapi/playground/blob/master/src/server/routes/html.js#L23.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity 😴
It will be closed in 60 days if no further activity occurs. To unstale this issue, add a comment with detailed explanation.
Thank you for your contributions ❤️

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity 😴
It will be closed in 60 days if no further activity occurs. To unstale this issue, add a comment with detailed explanation.
Thank you for your contributions ❤️

[magicmatatjahu]

As we are going in the direction of a simple SPA and we are not going to have a projects/organizations/users database (for now), I am closing this issue, because it is related to the old Studio implementation.