Revert "Update 01-intro/index.html"

This reverts commit dbe769629a3d02216ab82ead8c978828d2001faa.
Revert "Revert "Update 01-intro/index.html""

This reverts commit 306df909a51d5cb76d9471e5df3c4fc31162c09f.
Added named and content for paragraph.