Update master for 3.12 branching

[ColeHiggins2]

• [x] I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• [ ] 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[bot]]

The PR preview for 722f141a53fd1b8aa6e4952d9823147e69d9f067 is available at theforeman-foreman-documentation-preview-pr-3232.surge.sh

The following output files are affected by this PR:

• Installing_Proxy/index-foreman-el.html
• Installing_Proxy/index-katello.html
• Planning_for_Project/index-foreman-deb.html
• Planning_for_Project/index-foreman-el.html
• Planning_for_Project/index-katello.html
• Upgrading_Project/index-foreman-el.html
• Upgrading_Project/index-katello.html

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