This way we'll be able to customize some of the rules, which doesn't
seem to be possible when using the `.mdlrc` file.
For simplification purposes, instead of including all rules one by one,
we're excluding the few rules we don't use.
These files were both in the Consul Democracy repository and the
documentation repository. Since now both repositories have been merged
into one, we can remove the duplicate files.
Note there was a small difference in the `.mdlrc` file because we
changed it in commit b3a718ae6. We're keeping this change so we don't
get these syntax warnings in the documentation.
This rule would be fine if it only applied to headers within the same
section, but the way we structure our CHANGELOG.md file, each release
has the "Added", "Changed" and "Fixed" headers.
