feat: remove spack repository

spack/.gitignore

spack/README.md

spack/packages/dawn/exec.patch

spack/packages/dawn/install.patch

spack/packages/dawn/package.py

spack/packages/dawncut/install.patch

spack/packages/dawncut/package.py

spack/packages/farmhash/package.py

spack/packages/gaudi/package.py

spack/packages/geant4/birks.patch

spack/packages/geant4/package.py

spack/packages/jana2/package.py

spack/packages/tensorflow-lite/package.py

spack/repo.yaml