Move air gap bundle info to the relevant install topics

[paigecalvert]

This PR removes the preexisting topic on "how to download air gap bundles" in favor of putting that info directly in the relevant air gap installation topics. The reasoning for this change is because:

• People are most likely to need information on how to download air gap bundles when they are actually trying to do an air gap install
• When looking for info on how to download air gap bundles, people will need info about one or two types of bundles in particular, and don't need to see info about all the different air gap bundles. This can cause confusion
• If you landed on the topic about downloading air gap bundles, you'd be missing a lot of context and likely get confused about what you are supposed to do with the information

The solution was to do the following:

• Remove the topic on "how to build to air gap bundles"
• Redirect to the topic about how to access/download stuff from the Download Portal: https://deploy-preview-2721--replicated-docs-upgrade.netlify.app/vendor/releases-share-download-portal
• Add the steps on how to build release air gap bundles to a partial: https://github.com/replicatedhq/replicated-docs/pull/2721/files#diff-62506499cfb4131a5a34e3e5d307020bc0d8d2580cae5b5a29a7b3916178fcbc
• Add the steps on how to download air gap licenses to a partial as well: https://github.com/replicatedhq/replicated-docs/pull/2721/files#diff-8ec0735b0c6ed66e64cdd2afd783b42c68aae84985eee33f1db76a53ec9b7cef
• Replace the old xrefs to the topic on "how to build air gap bundles" with these partials instead. That way, the steps are right in the relevant procedures
• This also involves replacing some content in the updating and CLI install topics in addition to the regular air gap install topics

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[paigecalvert]

^ Previously, I was leaning pretty heavily on ".airgap" to talk about the release air gap bundle as opposed to the Admin Console or kURL bundles. Now that the EC bundle also uses the .airgap extension, felt like it would be better to spell out which bundle we are talking about in each case

[paigecalvert]

Note from convo with Alex this morning:

• We are going to remove this topic all together in favor of putting the info directly in the air gap installation topics. For example, the info about how to download the air gap bundle for the release will appear as a partial in the existing cluster KOTS and kURL air gap install topics.
• We also discussed making this information an actual step in the procedure rather than a prereq. This gives more space to provide screenshots/additional info, and makes it harder to miss
• The reasoning for this decision is that it can be overwhelming to see all the air gap bundle info together on a single topic. And, it's most likely that the only time people need this info is when they are actually getting ready to do an air gap install

[paigecalvert]

^ removed this section.

• releases-download-airgap-bundles was deleted
• licenses-download was moved to the Customer Licenses section
• releases-share-download-portal was moved to the Channels and Releases section
• releases-configvalues was moved to the CLI install section (the only workflow where vendors need it)