Added Excel template for accessions and descriptors

- Moved images/ to assets/
4 jobs for 262-excel-templates in 3 minutes and 12 seconds (queued for 1 second)
Status Name Job ID Coverage
  Package
passed package the branch #14983

00:02:51

 
  Dockerize
manual deploy for review #14985
allowed to fail manual
passed dockerize the branch #14984

00:00:21

manual remove review instance #14986
allowed to fail manual