[Feature] Add per-package pathway prediction (#195)

## Major Changes

- Introduces a new view for per-package predictions

Co-authored-by: jebus <lorsbach@envipath.com>
Reviewed-on: enviPath/enviPy#195
Co-authored-by: Tobias O <tobias.olenyi@envipath.com>
Co-committed-by: Tobias O <tobias.olenyi@envipath.com>

templates/actions/collections/pathway.html

@@ -1,6 +1,9 @@
 {% if meta.can_edit %}
-    <li>
-        <a href="{{ meta.server_url }}/predict">
-            <span class="glyphicon glyphicon-plus"></span> New Pathway</a>
-    </li>
+  <li>
+    <a
+      href="{% if meta.current_package %}{{ meta.current_package.url }}/predict{% else %}{{ meta.server_url }}/predict{% endif %}"
+    >
+      <span class="glyphicon glyphicon-plus"></span> New Pathway</a
+    >
+  </li>
 {% endif %}