Move openmp example to be parallel with MPI.

content/submitting_jobs/app_specific/submitting_an_openmp_job.md → content/submitting_jobs/submitting_an_openmp_job.md

 +++
 title = "Submitting an OpenMP Job"
 description =  "How to submit an OpenMP job on HCC resources."
+weight = 45
 +++
 
 Submitting an OpenMP job is different from