docs: add instructions to install pre-commit hooks in installation guide

Author: bybatkhuu

README.md

@@ -122,6 +122,9 @@ pip install -e .
 
 ```sh
 pip install -e .[dev]
+
+# Install pre-commit hooks:
+pre-commit install
 ```
 
 **OPTION E.** Install from **pre-built release** files:

docs/getting-started/installation.md

@@ -73,6 +73,9 @@ pip install -e .
 
 ```sh
 pip install -e .[dev]
+
+# Install pre-commit hooks:
+pre-commit install
 ```
 
 **OPTION E.** Install from **pre-built release** files: