Add docs to help choose the best GitLab installation method
What does this MR do?
Adds documentation to help customers choose the best installation method.
Related issues
Closes #54308 (closed)
Author's checklist
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Apply the correct labels and milestone -
Crosslink the document from the higher-level index -
Crosslink the document from other subject-related docs -
Port the MR to EE (or backport from CE): always recommended, required when the ee-compat-check
job fails https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/8646
Review checklist
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PM's review (recommended, but not a blocker) -
Technical writer's review (required) -
Merge the EE-MR first, CE-MR afterwards