Fix code blocks: restrict to parent container and let code lines overflow: scroll

title says it all. check https://about.gitlab.com/2015/02/17/gitlab-annex-solves-the-problem-of-versioning-large-binaries-with-git for the issue

low priority, do last

Reassigned to @sabbap

mentioned in merge request !539 (merged)

Status changed to closed by commit 0139a8e4

mentioned in commit 0139a8e4

mentioned in commit e3bf1ca8