Remove two unused org templates

One of these was empty. The other could not be viewed without giving a
`500` status code and isn't needed or linked to from anywhere.

app/templates/views/organisations/organisation/users/user/index.html

@@ -1,31 +0,0 @@
-{% extends "withnav_template.html" %}
-{% from "components/page-header.html" import page_header %}
-{% from "components/page-footer.html" import page_footer %}
-{% from "components/form.html" import form_wrapper %}
-{% from "components/back-link/macro.njk" import govukBackLink %}
-
-{% block service_page_title %}
-  {{ user.name or user.email_localpart }}
-{% endblock %}
-
-{% block backLink %}
-  {{ govukBackLink({ "href": url_for('.manage_org_users', org_id=current_org.id) }) }}
-{% endblock %}
-
-{% block maincolumn_content %}
-
-  {{ page_header(user.name or user.email_localpart) }}
-
-  <p class="govuk-body">
-    {{ user.email_address }}
-  </p>
-
-  {% call form_wrapper(class="govuk-grid-column-three-quarters") %}
-      {{ page_footer(
-        'Save',
-        delete_link=url_for('.remove_user_from_organisation', org_id=current_org.id, user_id=user.id) if user or None,
-        delete_link_text='Remove user from organisation'
-      ) }}
-  {% endcall %}
-
-{% endblock %}