Remove nested images since they are not supported by https://gitlab.com/gitlab-com/doc-gitlab-com
 Merge branch 'remove-nested-dir-in-docs' into 'master'

Remove nested dir in docs

Needed for https://gitlab.com/gitlab-com/doc-gitlab-com/issues/1

/cc @dzaporozhets
Also need to change the reference.
 Merge branch 'forgot-to-change-dir' into 'master'

Forgot to change dir

/cc @dzaporozhets

Related to https://gitlab.com/gitlab-com/doc-gitlab-com/issues/1
Revert "Allow to parse heroku-generated database.yml config file."

This reverts commit 8a56e7db485d3109f3b2f02896c1165c33ffa8fb.
Because it actually breaks db setup for mysql