Remove containerized 3.18

[jafiala]

What changes are you introducing?

Remove containerized links from 3.18

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

Containerized should not be available in 3.18

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

https://redhat.atlassian.net/browse/SAT-46059

Contributor 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 3.19/Katello 4.21
• Foreman 3.18/Katello 4.20 (Satellite 6.19)
• Foreman 3.17/Katello 4.19
• Foreman 3.16/Katello 4.18 (Satellite 6.18; orcharhino 7.6, 7.7, and 7.8)
• Foreman 3.15/Katello 4.17
• Foreman 3.14/Katello 4.16 (Satellite 6.17; orcharhino 7.4; orcharhino 7.5)
• Foreman 3.13/Katello 4.15 (EL9 only)
• Foreman 3.12/Katello 4.14 (Satellite 6.16; orcharhino 7.2 on EL9 only; orcharhino 7.3)
• We do not accept PRs for Foreman older than 3.12.

[github-actions]

The PR preview for 59cf88f is available at theforeman-foreman-documentation-preview-pr-4911.surge.sh

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