Update repository URLs in README and pyproject.toml to point to the correct GitHub organization

Author: mohanson

README.md

@@ -14,7 +14,7 @@ Features:
 ```sh
 $ pip install pabtc
 # or
-$ git clone https://github.com/mohanson/pabtc
+$ git clone https://github.com/libraries/pabtc
 $ cd pabtc
 $ python -m pip install --editable .
 ```

pyproject.toml

@@ -15,4 +15,4 @@ requires-python = ">=3.14"
 dependencies = ["requests"]
 
 [project.urls]
-homepage = "https://github.com/mohanson/pabtc"
+homepage = "https://github.com/libraries/pabtc"