Switches back to custom frontmatter stringification
until support lands in preliminaries. This is necessary
because we use custom schemas for certain data types,
such as dates and times.
* Files based collections skeleton
* listing file based cards
* create new entry with collection
* moved lookupEntry to main backend
* Editing single page Collections file
* List widget basic implementation
* Adjustments for test-repo
* check if value exists before trying to iterate over