Fix issues with Default handler and Refactor code

What's Changed

• Use docker images from GitHub Container Registry rather than Docker Hub by @forevermatt in #19
• Fix bugs in default handling and refactor code for less complexity by @jason-jackson in #21
• Document option of using a Cloudflare API Token by @forevermatt in #22
• fix build by @jason-jackson in #23

Full Changelog: v1.1.1...v1.1.2