remove resource markdown

[PaulBredl]

Description of changes

Remove resource markdown schema

How has this been tested?

Not necessary

Checklist before requesting a review

• My code is easy to understand
• My code follows the coding guidelines of this project
• My code fulfills all acceptance criteria
• The test coverage (line and branch) is reasonably high, especially on Service classes and other classes with complex logic
• I have made corresponding changes to the documentation or
  the wiki/adr
• I made no breaking changes in the database schema or if so, I will perform a database migration

Checklist for reviewer

• The code is easy to understand
• The code follows
  the coding guidelines of
  this project
• The code is tested or if not, the reason is documented or discussed
• The added and existing tests reasonably cover the code change
• The code has no breaking changes in the database schema or if so, the assignee is aware of it and
  will perform a database migration