Many code blocks are 4spaced, and they render in GitLab
without coloring as a result, even though they are
fenced with a language label. If in a list, other items
will render as being in a code block too, even if not
meant to. This fixes all these issues, and cleans up
minor white space issues in install and integration docs
There are several escaped angle brackets in our integration docs. While these
render fine within GitLab, they are broken rendered on doc.gitlab.com because
pandoc does not escape them correctly.
