Replacing 'HTTP' by 'HTTPS' for securing links

Currently, when we access the modified pages with **HTTP**, it is
redirected to **HTTPS** automatically. So this commit aims to
replace **HTTP** to **HTTPs** for security.
Co-Authored-By: Nguyen Phuong An <AnNP@vn.fujitsu.com>
Signed-off-by: Kim Bao Long <longkb@vn.fujitsu.com>