Remove reference to readme_renderer

And add a note about psycopg2 requirements to getting started doc.

Author: sgillies

docs/development/getting-started.rst

@@ -148,6 +148,11 @@ run all of the needed services. The Warehouse repository will be mounted inside
 the Docker container at :file:`/opt/warehouse/src/`. After the initial build,
 you should not have to run this command again.
 
+.. note::
+
+   On some systems ``make build`` may require the prior installation of libpq
+   and its headers so that psycopg2 can be compiled and installed.
+
 
 .. _running-warehouse-containers:
 

warehouse/templates/pages/help.html

@@ -628,8 +628,8 @@ <h2>{% trans %}Troubleshooting{% endtrans %}</h2>
 
         <h3 id="description-render-failure">{{ description_render_failure() }}</h3>
         <p>
-          {% trans trimmed readme_renderer_href='https://pypi.org/project/readme_renderer/', twine_check_href='https://twine.readthedocs.io/en/latest/#twine-check', title=gettext('External link') %}
-            PyPI will reject uploads if the package description fails to render. You may <a href="{{ twine_check_href }}" title="{{ title }}">use twine's check command</a> or <a href="{{ readme_renderer_href }}">readme_renderer</a>, the same description renderer used by PyPI, to locally check a description for validity.
+          {% trans trimmed href='https://twine.readthedocs.io/en/latest/#twine-check', title=gettext('External link') %}
+            PyPI will reject uploads if the package description fails to render. You may <a href="{{ href }}" title="{{ title }}">use twine's check command</a> to locally check a description for validity.
           {% endtrans %}
         </p>