Fix links in README guiding to another branch (EleutherAI#1838)

Author: LSinev

docs/README.md

@@ -4,7 +4,7 @@ Welcome to the docs for the LM Evaluation Harness!
 
 ## Table of Contents
 
-* To learn about the public interface of the library, as well as how to evaluate via the commandline or as integrated into an external library, see the [Interface](https://github.com/EleutherAI/lm-evaluation-harness/blob/big-refactor/docs/interface.md)
-* To learn how to add a new library, API, or model type to the library, as well as a quick explainer on the types of ways to evaluate an LM, see the [Model Guide](https://github.com/EleutherAI/lm-evaluation-harness/blob/big-refactor/docs/model_guide.md).
-* For a crash course on adding new tasks to the library, see our [New Task Guide](https://github.com/EleutherAI/lm-evaluation-harness/blob/big-refactor/docs/new_task_guide.md).
-* To learn more about pushing the limits of task configuration that the Eval Harness supports, see the [Task Configuration Guide](https://github.com/EleutherAI/lm-evaluation-harness/blob/big-refactor/docs/task_guide.md).
+* To learn about the public interface of the library, as well as how to evaluate via the commandline or as integrated into an external library, see the [Interface](./interface.md)
+* To learn how to add a new library, API, or model type to the library, as well as a quick explainer on the types of ways to evaluate an LM, see the [Model Guide](./model_guide.md).
+* For a crash course on adding new tasks to the library, see our [New Task Guide](./new_task_guide.md).
+* To learn more about pushing the limits of task configuration that the Eval Harness supports, see the [Task Configuration Guide](./task_guide.md).