docs: build-vyos: document build.py kernel build wrapperbuild-vyos-fixes

build-kernel.sh only builds the kernel. The build.py wrapper in
scripts/package-build/linux-kernel installs the build dependencies,
fetches and verifies the kernel source, builds the kernel and all
firmware and out-of-tree modules defined in package.toml.

- Document build.py usage and its --packages and
  --install-dependencies options.
- Update paths from packages/linux-kernel to
  scripts/package-build/linux-kernel and from data/defaults.json to
  data/defaults.toml; drop references to the removed Jenkinsfile.
- Update the out-of-tree module list to match package.toml.
- Drop the per-module build instructions which referenced renamed or
  removed helper scripts, and the no longer existing ADD_FW_FILES.

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