Update examples/README.md: remove old references and reorganize (#84)

* Update examples/README.md: remove old references and reorganize

* Delete verify_ppo.py

Author: droot

examples/README.md

@@ -16,16 +16,14 @@ This directory contains examples, demos, and helper scripts for using the Open-R
 ## Examples Overview
 
 ### Supervised Fine-Tuning (SFT)
-* **[Hello World SFT Sandbox](sft/hello-world):** A minimal fine-tuning pipeline that trains a model to output a specific, constant target answer (e.g., "foo") for a set of hardcoded questions, serving as an introductory "hello world" for basic API interactions.
 * **[Pig Latin Translation](sft/pig-latin):** Teaches a model to perform specialized Pig Latin transformations, demonstrating custom token-level targets and loss masks.
 * **[Text-to-SQL SFT](sft/text-to-sql):** Adapts Gemma 3 into a specialized database query assistant capable of generating SQL statements.
-* **[FunctionGemma](sft/function-gemma):** A recipe specifically targeted at fine-tuning tool-use capabilities, enabling models to reliably select and invoke functions.
-* **[Tinker Cookbook Recipes](tinker-cookbook):** Shows how to run Thinking Machines' `tinker_cookbook` recipes against Open-RL APIs.
+* **[FunctionGemma](sft/function-gemma):** Provides a recipe specifically targeted at fine-tuning tool-use capabilities, enabling models to reliably select and invoke functions.
 
 ### Reinforcement Learning (RL)
-* **[PPO Math Verification](rl):** Implements Proximal Policy Optimization (PPO) with advantages to verify step-by-step math reasoning paths.
-* **[RLVR Demo](rl/rlvr):** Showcases Reinforcement Learning with Verifiable Rewards (RLVR) on geography tasks, using deterministic format verification as the primary reward signal.
 * **[Text-to-SQL RL](rl/text-to-sql):** Runs the Gemma 4 SFT+RL recipe with SQL execution rewards and curve plotting.
-* **[Tinker RL Basic K8s Jobs](rl/tinker-rl-basic):** Example Kubernetes Job manifests for deploying scalable, distributed RL workloads to a multi-tenant cluster.
+
+### Tinker Cookbook
+* **[Tinker Cookbook Recipes](tinker-cookbook):** Examples showing how to run [Tinker Cookbook](https://github.com/thinking-machines-lab/tinker-cookbook) recipes with Open-RL.
 
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