Update README
- Replace references to old console with a link to the user guide
board-manager
page . - Build instructions: VSCode devcontainer is the preferred method - add instructions for that
- Development: List steps for implementing changes, for making tags, and for updating to new EMP plugin version (change base image tag in .gitlab-ci.yml, image in devcontainer config,
emp-swatch
version in CMakeLists.txt)