Documents with emoji as the name gets an invalid slug

Expected Behavior

Documents with emoji as the name should either be blocked by the API, or some more meaningful slug should be created (e.g. 😄 converted to smile)

Actual Behavior

Instead, currently, it gets an "invalid_name" slug.

Reposting from an issue posted in our fork at University of Edinburgh: compsoc-edinburgh/betterinformatics-files Issue #58: Using emoji for community document name causes invalid_name in link

Steps to Reproduce the Problem

1. Create a document with an emoji name
2. See the URL