Put index.html using unstable rustdoc features

README.md

-[![Azure Status]][Azure] [![Cirrus CI Status]][Cirrus CI] [![Latest Version]][crates.io] [![Documentation]][docs.rs] ![License]
+# libc - Raw FFI bindings to platforms' system libraries
 
-libc - Raw FFI bindings to platforms' system libraries
-====
+[![Azure Status]][Azure] [![Cirrus CI Status]][Cirrus CI] [![Latest Version]][crates.io] [![Documentation]][docs.rs] ![License]
 
 `libc` provides all of the definitions necessary to easily interoperate with C
 code (or "C-like" code) on each of the platforms that Rust supports. This

ci/dox.sh

@@ -52,9 +52,9 @@ while read -r target; do
 
     # If cargo doc fails, then try xargo:
     if ! cargo doc --target "${target}" \
-             --no-default-features  --features extra_traits ; then
+        --no-default-features --features extra_traits ; then
         cargo xdoc --target "${target}" \
-              --no-default-features  --features extra_traits
+        --no-default-features --features extra_traits
     fi
 
     cp -r "target/${target}/doc" "${TARGET_DOC_DIR}/${target}"
@@ -70,5 +70,7 @@ set +x
 { head -n "$((line-1))" $README; cat $PLATFORM_SUPPORT; tail -n "+$((line+1))" $README; } > $TARGET_DOC_DIR/$README
 set -x
 
+RUSTDOCFLAGS="--enable-index-page --index-page=${TARGET_DOC_DIR}/${README} -Zunstable-options" cargo doc
+
 # Copy the licenses
 cp LICENSE-* $TARGET_DOC_DIR/