(Proxy) add support for DOCS_URL and REDOC_URL (#6806)

* add support for DOCS_URL and REDOC_URL

* document env vars

* add unit tests for docs url and redocs url

litellm/proxy/proxy_server.py

@@ -222,7 +222,9 @@ from litellm.proxy.utils import (
     PrismaClient,
     ProxyLogging,
     _cache_user_row,
+    _get_docs_url,
     _get_projected_spend_over_limit,
+    _get_redoc_url,
     _is_projected_spend_over_limit,
     _is_valid_team_configs,
     get_error_message_str,
@@ -344,7 +346,6 @@ ui_message += "\n\n💸 [```LiteLLM Model Cost Map```](https://models.litellm.ai
 custom_swagger_message = "[**Customize Swagger Docs**](https://docs.litellm.ai/docs/proxy/enterprise#swagger-docs---custom-routes--branding)"
 
 ### CUSTOM BRANDING [ENTERPRISE FEATURE] ###
-_docs_url = None if os.getenv("NO_DOCS", "False") == "True" else "/"
 _title = os.getenv("DOCS_TITLE", "LiteLLM API") if premium_user else "LiteLLM API"
 _description = (
     os.getenv(
@@ -355,9 +356,9 @@ _description = (
     else f"Proxy Server to call 100+ LLMs in the OpenAI format. {custom_swagger_message}\n\n{ui_message}"
 )
 
-
 app = FastAPI(
-    docs_url=_docs_url,
+    docs_url=_get_docs_url(),
+    redoc_url=_get_redoc_url(),
     title=_title,
     description=_description,
     version=version,