AWS prescriptive-guidance documentation change
Summary
Renamed file from welcome.md to introduction.md, updated internal links, removed author affiliation details and document history, simplified content by removing topic list, and updated contraction formatting.
Security assessment
Changes are administrative and editorial (file rename, link updates, content pruning). No security-related content was added, removed, or modified. The removed topic list covered general backup architectures without security focus, and contraction change ('don’t' to 'don't') has no security impact.