ref(docs): clean up app ssl documentation

"Using App SSL" belongs in "Using Deis". I've also cleaned up some of
the more confusing terms like "domain ssl" in favour of "app ssl".

Author: Matthew Fisher

docs/reference/index.rst

@@ -11,7 +11,6 @@ Reference Guide
 
     usage
     terms/index
-    domain-ssl
     self-signed-certs
     client
     server/index

docs/reference/self-signed-certs.rst

@@ -6,7 +6,7 @@
 Creating a Self-Signed SSL Certificate
 ======================================
 
-When :ref:`using the domain ssl <domain_ssl>` feature for non-production applications or when
+When :ref:`using the app ssl <app_ssl>` feature for non-production applications or when
 :ref:`installing SSL for the platform <platform_ssl>`, you can avoid the costs associated with the SSL
 certificate by using a self-signed SSL certificate. Though the certificate implements full
 encryption, visitors to your site will see a browser warning indicating that the certificate should
@@ -70,4 +70,4 @@ The self-signed SSL certificate is generated from the server.key private key and
     $ openssl x509 -req -days 365 -in server.csr -signkey server.key -out server.crt
 
 The server.crt file is your site certificate suitable for use with
-:ref:`Deis's SSL endpoint <domain_ssl>` along with the server.key private key.
+:ref:`Deis's SSL endpoint <app_ssl>` along with the server.key private key.

docs/reference/domain-ssl.rst docs/using_deis/app-ssl.rstdocs/reference/domain-ssl.rst renamed to docs/using_deis/app-ssl.rst

@@ -2,10 +2,10 @@
 :description: Enabling and configuring SSL on applications using the SSL endpoint.
 
 
-.. _domain_ssl:
+.. _app_ssl:
 
-Using an SSL Certificate with Deis
-==================================
+Application SSL Certificates
+============================
 
 SSL is a cryptographic protocol that provides end-to-end encryption and integrity for all web
 requests. Apps that transmit sensitive data should enable SSL to ensure all information is

docs/using_deis/index.rst

@@ -21,3 +21,4 @@ Using Deis
     using-docker-images
     config-application
     manage-application
+    app-ssl