[gen/wiki] show disk id for each disk and make disk0 the primary

Previously, the main disk was sda which is not true for neowise.
5 jobs for disk_id in 6 minutes and 12 seconds (queued for 1 second)
Status Job ID Name Coverage
  Validate
passed #1239648
grid5000-docker
rubocop

00:00:24

passed #1239649
grid5000-docker
validate-data

00:01:36

 
  Generate
passed #1239650
grid5000-docker
generate-reference-api

00:01:23

 
  Deploy
passed #1239651
grid5000-shell
deploy

00:00:07

passed #1239652
grid5000-docker
rspec

00:03:12