[doc] move environment variables to reference section

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diff --git a/docs/reference/environment_variables.rst b/docs/reference/environment_variables.rst
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+Environment Variables
+=====================
+
+Some environment variables affect the behaviour of Soledad:
+
+============================== =============== =================================
+variable                       affects         description
+============================== =============== =================================
+``SOLEDAD_HTTP_PERSIST``       client          persist HTTP connections.
+``SOLEDAD_USE_PYTHON_LOGGING`` client / server use python logging instead of
+                                               twisted's logger.
+``SOLEDAD_LOG_TO_STDOUT``      client / server log to standard output.
+``SOLEDAD_SERVER_CONFIG_FILE`` server          use this configuration file
+                                               instead of the default one.
+``LOCAL_SERVICES_PORT``        server          which port to use for local
+                                               TCP services.
+``HTTPS_PORT``                 server          which port to use for public
+                                               HTTPS services.
+============================== =============== =================================