Avoid generating unused docs index page.

The unstable flag also results in rustdoc emitting absolute links, which
breaks versioned documentation.

scripts/mk-docs.sh

@@ -20,8 +20,10 @@ fi
 echo ":::: Generating docs (${DOC_VERSION})..."
 pushd "${PROJECT_ROOT}" > /dev/null 2>&1
   # Set the crate version and fill in missing doc URLs with docs.rs links.
-  RUSTDOCFLAGS="-Zunstable-options --crate-version ${DOC_VERSION} --extern-html-root-url rocket=https://api.rocket.rs/rocket/" \
-    cargo doc -Zrustdoc-map --no-deps --all-features \
+  RUSTDOCFLAGS="-Z unstable-options \
+      --crate-version ${DOC_VERSION} \
+      --generate-link-to-definition" \
+      cargo doc -Zrustdoc-map --no-deps --all-features \
         -p rocket \
         -p rocket_db_pools \
         -p rocket_sync_db_pools \