show curl output for bulk deletions

now the app generates strings like this that can be copy pasted into terminal:

```
curl -X POST http://max.ic.ht/critters/_bulk_docs -d '{"docs":[{"_id":"cd4887acbc965958e37a609baa0561a0","_rev":"1-2ad2e23a1c547dd3f76e46a013ecb951","_deleted":true}]}' -H 'content-type: application/json'
```

all you have to do is instead of http://max.ic.ht put http://user:pass@max.ic.ht for the deletions to go through