v1.5.0: Random template selecting

Changed

• Repository files structure
• Nginx updated from 1.18 up to 1.19 in docker image
• Docker image now uses default nginx entrypoint scripts and command

Added

• Support for linux/arm64/v8, linux/arm/v6 and linux/arm/v7 platforms for docker image
• Random template selecting (use random as a template name) for docker image