Revert "remove index.html"

This reverts commit 93d339550cbf847821db6850c9a93f68d95735b5.
Revert "Revert "remove index.html""

This reverts commit 618b1ca83b5d9bb234a064effaa8c4be66b592ce.
Revert "Revert "Revert "remove index.html"""

This reverts commit 45b4a01e4bd1a1ff629058e24a67904eaf9921af.
modify index.html