First it changes the entries to categories. That is CV_ENV is now category
for everything. Then cventry continues to behave as before, but CATEGORY
social comes in.
For the moment it creates a formatted block
Previously a cventry was inside a div and forced a h3 heading. The content
would not me inside the div because on markdown it wouldn't be
rendered. For limitation it is better to drop the div, make the heading
respect the org level and the properties list is just in one UL tag
