Revert "add about.html"

This reverts commit 02a41d5856dc8fec942f6df4b7a01bc5a5727af1.
update index.html

few more step toward trial
Revert "update index.html"

This reverts commit 195d585a2ea43cd1a21db7aa3b1f9d06a315a4ed.
Revert "Revert "update index.html""

This reverts commit de2e9897052c88aa3ed2d43d780e5dd05b969696.