update broken links in README (#1456)

README.md

@@ -122,10 +122,10 @@ Documentation on the framework and how to use it can be found [here](https://doc
 | Super fast voice agent using Cerebras hosted Llama 3.1                | [demo](https://cerebras.vercel.app)            | [code](https://github.com/dsa/fast-voice-assistant/)                                                          |
 | Voice agent using Cartesia's Sonic model                              | [demo](https://cartesia-assistant.vercel.app/) | [code](https://github.com/livekit-examples/cartesia-voice-agent)                                              |
 | Agent that looks up the current weather via function call             | N/A                                            | [code](https://github.com/livekit/agents/blob/main/examples/voice-pipeline-agent/function_calling_weather.py) |
-| Voice Agent using Gemini 2.0 Flash                                    | N/A                                            | [code](https://github.com/livekit-examples/voice-pipeline-agent/gemini_voice_agent.py)                        |
+| Voice Agent using Gemini 2.0 Flash                                    | N/A                                            | [code](https://github.com/livekit/agents/blob/main/examples/voice-pipeline-agent/gemini_voice_agent.py)       |
 | Voice agent with custom turn-detection model                          | N/A                                            | [code](https://github.com/livekit/agents/blob/main/examples/voice-pipeline-agent/turn_detector.py)            |
 | Voice agent that performs a RAG-based lookup                          | N/A                                            | [code](https://github.com/livekit/agents/tree/main/examples/voice-pipeline-agent/simple-rag)                  |
-| Simple agent that echos back the last utterance                       | N/A                                            | [code](https://github.com/livekit/agents/tree/main/examples/echo-agent)                                       |
+| Simple agent that echos back the last utterance                       | N/A                                            | [code](https://github.com/livekit/agents/blob/main/examples/echo-agent.py)                                    |
 | Video agent that publishes a stream of RGB frames                     | N/A                                            | [code](https://github.com/livekit/agents/tree/main/examples/simple-color)                                     |
 | Transcription agent that generates text captions from a user's speech | N/A                                            | [code](https://github.com/livekit/agents/tree/main/examples/speech-to-text)                                   |
 | A chat agent you can text who will respond back with generated speech | N/A                                            | [code](https://github.com/livekit/agents/tree/main/examples/text-to-speech)                                   |