Revert "putting new images in the header"

This reverts commit 30a7d09d115ca30951316a798fc9931d59aaa39d.
Revert "Revert "putting new images in the header""

This reverts commit e17c341d3b7340ab7c88acd80ac1a4fe2f5b519a.
font change in the article
fixed header style