Merge branch 'docs_fix_duplicates' into 'master'

Removed duplicates of files and unused reference

See merge request !146
5 jobs for master in 11 minutes and 19 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test_min #184146

00:02:29

passed test_mpi #184147

00:03:34

passed test_mpi_fftw #184148

00:04:13

passed test_mpi_fftw_hdf5 #184149

00:05:23

57.0%
 
  Release
passed release_image_master #184150

00:05:56