Multiarch Docker support and improved Compose

[Fazendaaa]

Hey, Kanishka, thank you for this amazing, well made and described project.

I saw that the current Dockerfile has an old standard and is Debian-based, that being said I wanted to add multiarch build support trough the new buildx feature. Some changes that I've made:

• Dockerfile is now Alpine Linux based
• Removed Dockerfile.armv7 and Dockerfile.nginx as they are not needed anymore
• Changed the .gitingore
• Added an entrypoint.sh file to the new Dockerfile
• Created a Makefile to automate builds
• Upgraded a Python dependency

I did this because I wanted to self hos your project in my Rancher -- Kubernetes --cluster.

Thank you again for such an awesome project.