This commit introduces a new bash script, build_and_push_images.sh, which automates the process of building and pushing Docker images for l2sm-switch, l2sm-controller, and l2sm-operator.

This script simplifies the image creation and push workflow, providing options for building images, pushing images, or both.

Adjusted the file paths in the Dockerfiles to align with the recent repository restructuring. This ensures that the Docker images now correctly reference the files in their new locations.

This change was necessary to maintain consistency and compatibility with the updated repository structure. It ensures that the Docker images can be built successfully and reflects the latest organization of project files.

The source code directory has been moved from ./build to ./src.

This change was made to improve project organization and follow best practices.