Update app description in environment configs

Set PUBLIC_APP_DESCRIPTION in both .env and prod.yaml to 'Making the community's best AI chat models available to everyone.' to provide a consistent description across environments.

.env

@@ -23,7 +23,7 @@ MONGODB_DIRECT_CONNECTION=false
 PUBLIC_APP_GUEST_MESSAGE=# a message to the guest user. If not set, no message will be shown. Only used if you have authentication enabled.
 PUBLIC_APP_NAME=ChatUI # name used as title throughout the app
 PUBLIC_APP_ASSETS=chatui # used to find logos & favicons in static/$PUBLIC_APP_ASSETS
-PUBLIC_APP_DESCRIPTION=# description used throughout the app
+PUBLIC_APP_DESCRIPTION="Making the community's best AI chat models available to everyone."# description used throughout the app
 PUBLIC_SMOOTH_UPDATES=false # set to true to enable smoothing of messages client-side, can be CPU intensive
 PUBLIC_ORIGIN=
 PUBLIC_SHARE_PREFIX=

chart/env/prod.yaml

@@ -65,6 +65,7 @@ envVars:
   MESSAGES_BEFORE_LOGIN: "999"
   PUBLIC_APP_ASSETS: "huggingchat"
   PUBLIC_APP_NAME: "HuggingChat"
+  PUBLIC_APP_DESCRIPTION: "Making the community's best AI chat models available to everyone"
   PUBLIC_ORIGIN: "https://huggingface.co"
   PUBLIC_PLAUSIBLE_SCRIPT_URL: "/js/script.js"