Remove outdated references to old Volto default-homepage profile

Author: davisagli

docs/developer-guide/create-a-distribution.md

@@ -162,9 +162,6 @@ As an example, the configuration for a new Plone site with Volto as its frontend
     "plone.app.caching:default",
     "plonetheme.barceloneta:default",
     "plone.volto:default"
-  ],
-  "content": [
-    "plone.volto:default-homepage"
   ]
 }
 ```

docs/install/containers/images/frontend.md

@@ -101,14 +101,10 @@ services:
 
   backend:
     image: plone/plone-backend:{PLONE_BACKEND_MINOR_VERSION}
-    # Plone 5.2 series can be used too
-    # image: plone/plone-backend:5.2.7
     ports:
       - '8080:8080'
     environment:
       - SITE=Plone
-      - 'ADDONS=plone.restapi==8.21.0 plone.volto==4.0.0a3 plone.rest==2.0.0a2 plone.app.iterate==4.0.2 plone.app.vocabularies==4.3.0'
-      - 'PROFILES=plone.volto:default-homepage'
 
   frontend:
     image: 'myfrontend:latest'