Update the merchdocs index and site url

[belbiy]

1. Changes the app switcher URL to use the new user-guide address.
2. Updates the federated search with new index (has to be done on all the websites)

NOTE: It’s basically a template for updating all the websites with new URL.

[jeff-matthews]

This isn't within the scope of this PR, but why is the user-guide piece of the URL necessary?

[belbiy]

@jeff-matthews, this is essentially a base url for the results from that website. Or you asking why do we need user-guide for merchant docs at all, and should use the root of docs.magento.com?

[jeff-matthews]

@belbiy, this:

why do we need user-guide for merchant docs at all, and should use the root of docs.magento.com?

it seems unnecessary

[belbiy]

I agree from the user perspective, it makes sense. It's a user guide for Magento.

But from our internal deployment perspective that I think was too risky, to get rid of user-guide as an enclosing folder for the merchdocs repo output. I dont fully understand the build logic, but there's other repos like merchdocs-mbi that can be affected (or not). But let's continue that converstation in Slack and possibly revisit that.