Remove unused bloodhound-js dependency. (#2846)

* Remove unused bloodhound-js dependency.

Pre-existing code is using a `Bloodhound` object actually from alternate `typeahead.js` package, see:

https://github.com/projectblacklight/blacklight/blob/v7.31.0/app/javascript/blacklight/autocomplete.js#L2

   import Bloodhound from 'typeahead.js/dist/bloodhound.js'

That is importing Bloodhound from typeahead.js package, not from bloodhound-js package. As far as I can tell, no use of `bloodhound-js` package is actually being made, so the dependency is unnecessary. Eliminating it will keep blacklight-consuming builds faster and smaller with simpler dependency trees.

package.json

@@ -28,7 +28,6 @@
   },
   "browserslist": "> 0.25%, not dead",
   "dependencies": {
-    "bloodhound-js": "^1.2.3",
     "bootstrap": ">=4.3.1 <6.0.0",
     "jquery": "^3.5.1",
     "typeahead.js": "^0.11.1"