* init wip
still needs html, styling, and specs
* add more html
similar to singleListing.jsx
* add generate_new_liquid method to spec
* remove unexpected period
* add error handling for invalid slugs and expired listings
* initial styling
* styling for author and tags
* import variables to sass
* more styling and swithc tags and author info
* add specs
* handle error for slug with no category
* add listing tag to editor guide
* reduce complexity
* render expired listing rather than raise error
* update expired listing spec
* import mixins to classified listing tag styling
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