Removing unreachable alias entries to avoid confusion (#104)

Just cleaning up aliases.json to remove unreachable entries and avoid
confusion.

Co-authored-by: Jim Mendenhall <jimjimovich@gmail.com>
Co-authored-by: Carmine Paolino <carmine@paolino.me>

Author: 3 people

lib/ruby_llm/aliases.json

@@ -34,32 +34,5 @@
   "claude-2-1": {
     "anthropic": "claude-2.1",
     "bedrock": "anthropic.claude-2.1"
-  },
-  "gpt-4o": {
-    "openai": "gpt-4o-2024-11-20"
-  },
-  "gpt-4o-mini": {
-    "openai": "gpt-4o-mini-2024-07-18"
-  },
-  "gpt-4-turbo": {
-    "openai": "gpt-4-turbo-2024-04-09"
-  },
-  "gemini-1.5-flash": {
-    "gemini": "gemini-1.5-flash-002"
-  },
-  "gemini-1.5-flash-8b": {
-    "gemini": "gemini-1.5-flash-8b-001"
-  },
-  "gemini-1.5-pro": {
-    "gemini": "gemini-1.5-pro-002"
-  },
-  "gemini-2.0-flash": {
-    "gemini": "gemini-2.0-flash-001"
-  },
-  "o1": {
-    "openai": "o1-2024-12-17"
-  },
-  "o3-mini": {
-    "openai": "o3-mini-2025-01-31"
   }
 }