Remove files copied from purl-spec from vers-spec

[mjherzog]

The task is to remove purl-spec files that are not relevant for vers-spec including:

• faq.rst
• PURL-SPECIFICATION.rst
• PURL-TYPES.rst
• purl-types-index.json
• The folder /meetings and its files
• The files in /schemas
• The files in /tests
• The folder /types-doc and its files
• The folder /types and its files

[mjherzog]

This work has been completed.