Description of problem:

In the "Installing RHDH in an air-gapped environment" document there is a link to a script to run to prepare the catalog.  The link is currently broken.

Prerequisites (if any, like setup, operators/versions):

N/A

Steps to Reproduce

1. Go to the [Restricted Network installation docs|http://example.com].
2. In the "Procedure" section, click on the "Source" link that should take you to the shell script.
3. You will get a 404 or a GitHub page that says the file doesn't exist.

Actual results:

See Steps to Reproduce

Expected results:

The link (and the curl command in the code block) should be valid links.

Reproducibility (Always/Intermittent/Only Once):

Always.

Build Details:

Additional info (Such as Logs, Screenshots, etc):

It would seem this is the proper link (for the 1.3 documentation):
https://github.com/redhat-developer/rhdh-operator/blob/release-1.3/.rhdh/scripts/prepare-restricted-environment.sh