message: add redirects (and remove redundant)
diff: @@ -131,12 +131,14 @@ impl Blacksmith {
  ("rustc-diagnostic-code.html", "/compiler/diagnostic-codes.html"),
  ("rustc-team-maintenance.html", "/infra/team-maintenance.html"),
  ("stabilization-guide.html", "https://rust-lang.github.io/rustc-guide/stabilization_guide.html"),
  - ("stabilization-guide.html", "https://rust-lang.github.io/rustc-guide/stabilization_guide.html"),
  ("state-of-rust.html", "https://github.com/rust-lang/rust/projects/8"),
  ("test-suite.html", "https://rust-lang.github.io/rustc-guide/tests/intro.html"),
  ("toolstate.html", "/infra/toolstate.html"),
  ("triage-procedure.html", "/release/triage-procedure.html"),
  ("x-py.html", "https://rust-lang.github.io/rustc-guide/building/how-to-build-and-run.html"),
  + ("bug-fix-procedure.html", "https://rust-lang.github.io/rustc-guide/bug-fix-procedure.html"),
  + ("diagnostic-codes.html", "https://rust-lang.github.io/rustc-guide/diagnostics/diagnostic-codes.html"),
  + ("profile-queries.html", "https://rust-lang.github.io/rustc-guide/queries/profiling.html"),
  ];
  // Inititalise book directory if not built yet.
  