removed mixtral from open router and removed unused env keys from .env.example

.env.example

@@ -4,8 +4,3 @@
 # OpenRouter API key (if using OpenRouter as a provider)
 
 OPENROUTER_API_KEY=your-openrouter-api-key
-# Optional: Site metadata for OpenRouter ranking (see docs)
-OPENROUTER_SITE_URL=http://localhost:8501
-OPENROUTER_SITE_NAME=SlideDeck AI
-
-STREAMLIT_SERVER_RUN_ON_SAVE=true

global_config.py

@@ -82,11 +82,7 @@ class GlobalConfig:
             'description': 'OpenRouter GPT-4 Omni',
             'max_new_tokens': 8192,
             'paid': True,
-        },
-        '[or]openrouter/mixtral-8x22b-instruct': {
-            'description': 'Mixtral 8x22B Instruct (via OpenRouter)',
-            'max_new_tokens': 2048,
-        },
+        }
     }
     LLM_PROVIDER_HELP = (
         'LLM provider codes:\n\n'