Create incremental CVs by adding Deb packages

[maximiliankolb]

What changes are you introducing?

Add Hammer CLI instructions on how to add packages to a CV version.

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

Refs https://community.theforeman.org/t/incremental-update-not-working/38811/6?u=maximilian

Anything else to add? (Considerations, potential downsides, alternative solutions you have explored, etc.)

Checklists

• I am okay with my commits getting squashed when you merge this PR.
• I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• Foreman 3.12/Katello 4.14 (Satellite 6.16)
• Foreman 3.11/Katello 4.13
• Foreman 3.10/Katello 4.12
• Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• Foreman 3.8/Katello 4.10
• Foreman 3.7/Katello 4.9 (Satellite 6.14)
• Foreman 3.6/Katello 4.8
• Foreman 3.5/Katello 4.7 (Satellite 6.13; orcharhino 6.6/6.7)
• We do not accept PRs for Foreman older than 3.5.

[github-actions]

The PR preview for 3867f8d is available at theforeman-foreman-documentation-preview-pr-3403.surge.sh

The following output files are affected by this PR:

• Managing_Content/index-katello.html
• Managing_Content/index-orcharhino.html

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