Merge branch 'self-service-docs' into 'master'

self_service: add docs for JSON file upload

See merge request !101
4 jobs for master in 10 minutes and 50 seconds (queued for 7 seconds)
Status Job ID Name Coverage
  Test
passed #248431
ruby-style

00:02:20

passed #248430
stable

00:09:56

passed #248429
testing

00:10:46

passed #248428
unstable

00:10:34