Polish the MesaLock Linux project

- CI integration
- Reorganize file structure
- Update core script to improve building experience
- Adding more examples in the packages
- Bug fixes
- Update readme

We are pleased to announce the first public release of MesaLock Linux…

…. Here is an overview of the project.

  - You can build an live ISO and rootfs for docker container
  - Essential packages are provided
  - The building process works now, e.g., dependencies, Dockerfile for building