Move jump button logic to tailbone-corepos

since that now supports jump button for Vendor also, maybe others to come

rattail_demo/web/templates/products/view.mako

@@ -1,27 +0,0 @@
-## -*- coding: utf-8; -*-
-<%inherit file="tailbone:templates/products/view.mako" />
-
-<%def name="object_helpers()">
-  ${parent.object_helpers()}
-  ${self.render_xref_helper()}
-</%def>
-
-<%def name="render_xref_helper()">
-  <div class="object-helper">
-    <h3>Cross-Reference</h3>
-    <div class="object-helper-content">
-      <b-button type="is-primary"
-                % if core_office_url:
-                tag="a" href="${core_office_url}" target="_blank"
-                % else:
-                disabled title="${core_office_why_no_url}"
-                % endif
-                >
-        View in CORE Office
-      </b-button>
-    </div>
-  </div>
-</%def>
-
-
-${parent.body()}