chore: remove absolute paths (#3263)

# What does this PR do?
Finding these issues while moving to github pages.


## Test Plan
uv run --group docs sphinx-autobuild docs/source docs/build/html
--write-all

docs/source/building_applications/playground/index.md

@@ -88,7 +88,7 @@ Interactive pages for users to play with and explore Llama Stack API capabilitie
 - **API Resources**: Inspect Llama Stack API resources
   - This page allows you to inspect Llama Stack API resources (`models`, `datasets`, `memory_banks`, `benchmarks`, `shields`).
   - Under the hood, it uses Llama Stack's `/<resources>/list` API to get information about each resources.
-  - Please visit [Core Concepts](https://llama-stack.readthedocs.io/en/latest/concepts/index.html) for more details about the resources.
+  - Please visit [Core Concepts](../../concepts/index.md) for more details about the resources.
 
 ### Starting the Llama Stack Playground
 

docs/source/building_applications/responses_vs_agents.md

@@ -3,7 +3,7 @@
 Llama Stack (LLS) provides two different APIs for building AI applications with tool calling capabilities: the **Agents API** and the **OpenAI Responses API**. While both enable AI systems to use tools, and maintain full conversation history, they serve different use cases and have distinct characteristics.
 
 ```{note}
-For simple and basic inferencing, you may want to use the [Chat Completions API](https://llama-stack.readthedocs.io/en/latest/providers/index.html#chat-completions) directly, before progressing to Agents or Responses API.
+ **Note:** For simple and basic inferencing, you may want to use the [Chat Completions API](../providers/openai.md#chat-completions) directly, before progressing to Agents or Responses API.
 ```
 
 ## Overview
@@ -173,7 +173,7 @@ Both APIs demonstrate distinct strengths that make them valuable on their own fo
 
 ## For More Information
 
-- **LLS Agents API**: For detailed information on creating and managing agents, see the [Agents documentation](https://llama-stack.readthedocs.io/en/latest/building_applications/agent.html)
+- **LLS Agents API**: For detailed information on creating and managing agents, see the [Agents documentation](agent.md)
 - **OpenAI Responses API**: For information on using the OpenAI-compatible responses API, see the [OpenAI API documentation](https://platform.openai.com/docs/api-reference/responses)
-- **Chat Completions API**: For the default backend API used by Agents, see the [Chat Completions providers documentation](https://llama-stack.readthedocs.io/en/latest/providers/index.html#chat-completions)
-- **Agent Execution Loop**: For understanding how agents process turns and steps in their execution, see the [Agent Execution Loop documentation](https://llama-stack.readthedocs.io/en/latest/building_applications/agent_execution_loop.html)
+- **Chat Completions API**: For the default backend API used by Agents, see the [Chat Completions providers documentation](../providers/openai.md#chat-completions)
+- **Agent Execution Loop**: For understanding how agents process turns and steps in their execution, see the [Agent Execution Loop documentation](agent_execution_loop.md)