Resolves https://github.com/webrecorder/browsertrix/issues/2298
## Changes
- Slugs added to collections, can be specified separately when creating
or updating collections or else is based off of supplied collection name
- Migration added to backfill slugs for existing collections
- Redirect collection to newest slug if changed
- Adds option to copy public profile link to "Public Collections" action
menu
- Show "Back to <Org>" link instead of breadcrumbs
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Co-authored-by: sua yoo <sua@suayoo.com>
Co-authored-by: Ilya Kreymer <ikreymer@gmail.com>
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