Revert update to ParseMD and investigate ESM compatible solution

[jenny-s51]

Is this a new page or a change to an existing one?
Revert the change made in https://github.com/patternfly/patternfly-org/pull/4004/files#diff-97bd431987a2e7dda0f66ad7f07ac6cf4eeebf21fbe44a1b45ef905968aa14caR207

Describe the enhancement

In order to get Typescript 4.7.4 to work in v6 with the visit function, we will have to investigate some potential approaches.

This may involve:

• Upgrading to use ESM throughout org and generally moving away from CommonJS

or

• Investigating if we can use another set of tools instead of unist-util to avoid any ESM-related issues