Direct to RHSCL Packaging guide and/or add a warning about possible end of the site

[hhorak]

Most of the folks seem to go to the page to check the Packaging guide. More recent version of the packaging guide is actually available without need of authentication at [1].

We should ideally replace the link to the guide to direct folks to that page [1] and ideally also add a warning somewhere visibly that the page might stop exist at some point (as RHEL7 is getting EOL next year [2]). It's better if people learn to consume the guide from a different place before the web stops existing.

[1] https://access.redhat.com/documentation/en-us/red_hat_software_collections/3/html/packaging_guide/index
[2] https://access.redhat.com/support/policy/updates/errata

[nisbet-hubbard]

It should also be noted that copr-specific packaging instructions [1] are not included in the guide at RH [2].

Depending on whether copr will still be the approved way to build RPMs for inclusion in an official directory like this site going forward, copr-specific instructions may need to be incorporated into the RH version and be extended to cover spec files for main packages [3] in addition to that of the metapackage.

[1] https://www.softwarecollections.org/en/docs/
[2] https://access.redhat.com/documentation/en-us/red_hat_software_collections/3/html/packaging_guide/index
[3] https://access.redhat.com/documentation/en-us/red_hat_software_collections/3/html/packaging_guide/sect-converting_a_conventional_spec_file