Revert "add branch"

This reverts commit c41555af2e929c60d025f72208aa3f81570f581b.
Revert "add pdf"

This reverts commit 5db04c7c2297fe3bf2c0da876fb9250e62a90ee2.
Revert "Fixed navigation"

This reverts commit beb8b2e89e4e559e9bb33b20ac67125202c96329.
Revert "Sticky Navigator!!"

This reverts commit 2415a233df0ea08f07842b9cbf9960e4c8397740.