Upgrade to rockylinux, migrate bower to yarn, fix misc issues

[nguyandy]

• upgrade Docker image from centos7 to rockylinux8
• migrate from bower to yarn, handle post install symlinks
• update yarn dependencies
• update python dependencies
• fix ncdump generation in compliance report
• fix report download
• fix form submission

you should be able to get it all up and running with docker-compose up --build