[Feature] Implement Search modal in Modern UI (#185)

Implementing a search modal (stretching the level of dynamic that is possible without going to frameworks).

## Major Change
- Search needs packages and is available everywhere now; so had to add reviewed and user packages to global context.

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#185
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

envipath/settings.py

@@ -87,6 +87,7 @@ TEMPLATES = [
                 "django.template.context_processors.request",
                 "django.contrib.auth.context_processors.auth",
                 "django.contrib.messages.context_processors.messages",
+                "epdb.context_processors.package_context",
             ],
         },
     },