Enhanced Metadata for Pages

Hey there! 

It would be helpful to allow additional metadata to be stored on pages, which could then be queried via the search function.
In daily use, this could include alternative titles (especially useful when using a page for one software feature), specific variants or identifiers that refer to third-party software (JIRA numbers), or version numbers. Adding a date field would also be beneficial, especially when working with large files, to better track updates and content relevance.