Identify Home and Index Pages

Currently only the index page it tagged to be identifiable. Since tags should be documented and are typical shown, the identification of home and index pages, which is probably only technically relevant, should not be shown.

Therefore the metadata will be moved to the Flags property.

In order to make the flags unique and not interfere with the information design of users, they will be prefixed with "projectdoc.".

The index page will be flagged with

projectdoc.doctype-index, projectdoc.all, projectdoc.related.doctype.${doctypeId}.

The home page will be flagged with

projectdoc.doctype-index, projectdoc.all, projectdoc.related.doctype.${doctypeId}