Remove empty Aurora pages

[felker]

Following 2024-11-13 Aurora docs planning discussion (@simspartacz)

[felker]

Suspected empty/placeholder pages in Aurora section:

❯ pwd
/Users/felker/Desktop/user-guides/docs/aurora
❯ wc -l **/*.md | sort
     1 applications-and-libraries/libraries/math-libraries.md
     1 applications-and-libraries/libraries/mkl.md
     1 applications-and-libraries/libraries/onedal.md
     1 compiling-and-linking/cce-compilers-aurora.md
     1 compiling-and-linking/continuous-integration-aurora.md
     1 compiling-and-linking/gnu-compilers-aurora.md
     1 compiling-and-linking/llvm-compilers-aurora.md
     1 data-science/applications/gpt-neox.md
     1 data-science/containers/containers.md
     1 data-science/frameworks/deepspeed.md
     1 data-science/frameworks/jax.md
     1 data-science/julia.md
     1 performance-tools/performance-overview.md
     1 visualization/paraview.md
     1 workflows/balsam.md
     1 workflows/deephyper.md
     1 workflows/libensemble.md
     1 workflows/parsl.md
     3 applications-and-libraries/libraries/mpi.md
     3 debugging/gdb-oneapi-aurora.md
     3 programming-models/raja-aurora.md
     3 services/jupyterhub.md
     7 data-management/lustre/flare.md
...