Note in example.env about client side asset compilation variables (#1743

)

example.env

@@ -21,10 +21,10 @@ SERVER_LOG_LEVEL=
 # Optional DB replica for reads:
 READ_ONLY_DATABASE_URL=
 POSTGRES_DB=polis-dev
-POSTGRES_HOST=postgres:5432
-POSTGRES_PASSWORD=oiPorg3Nrz0yqDLE
 POSTGRES_PORT=5432
+POSTGRES_HOST=postgres:${POSTGRES_PORT}
 POSTGRES_USER=postgres
+POSTGRES_PASSWORD=oiPorg3Nrz0yqDLE
 DATABASE_URL=postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${POSTGRES_HOST}/${POSTGRES_DB}
 
 
@@ -125,3 +125,14 @@ ENCRYPTION_PASSWORD_00001=
 # (Deprecated) Basic Auth settings for certain requests between math and api services.
 WEBSERVER_PASS=ws-pass
 WEBSERVER_USERNAME=ws-user
+
+
+###### CLIENT SIDE CONFIG ######
+# If building client assets, only the following variables are needed:
+# * EMBED_SERVICE_HOSTNAME
+# * FB_APP_ID
+# * GA_TRACKING_ID
+# * ENABLE_TWITTER_WIDGETS
+# * SERVICE_URL (if static assests are served from a separate domain than API, as described above)
+
+