[Misc.] Remove fla from third-party

Author: sustcsonglin

README.md

@@ -23,12 +23,18 @@ cd flame
 pip install .
 ```
 
-`flame` manages minimal dependencies, only including `fla` and `torchtitan` as submodules.
+Install the latest version of fla
+```
+pip uninstall flash-linear-attention && pip install -U --no-use-pep517 git+https://github.com/fla-org/flash-linear-attention
+```
+
+`flame` manages minimal dependencies, only including `lm-evaluation-harness` and `torchtitan` as submodules.
 After installation, initialize and update the submodules:
 ```sh
 git submodule update --init --recursive
 ```
 
+
 ## Dataset Preparation
 To download the dataset to your local disk, create a new Python file with the following content and execute it: