Update the yamllint rules

Controlling the line length in the files generated from the Markdown to
YAML conversion would be difficult so we disable that yamllint rule.

.yamllint

@@ -5,3 +5,6 @@ rules:
   # yamllint doesn't like when we use yes and no for true and false,
   # but that's pretty standard in Ansible.
   truthy: disable
+
+  # Enforcing this rule would be complicated for auto-generated data right now.
+  line-length: disable