Update install via uv (#836)

* Simplify header

- The default index from which uv fetches packages is PyPI

* Simplify codeblock

- uv was designed to replace pip and so uv add is preferred over uv pip install

* Update the remaining examples

- Replace uv pip install by uv add
- Delte from PyPI from headers

* Fix examples with opt dependencies

Author: emilioMaddalena

docs/installation.rst

@@ -51,29 +51,27 @@ Install ``causalml`` with ``torch`` for ``CEVAE`` from ``PyPI``
     pip install causalml[torch]
 
 
-Install from ``PyPI`` using `uv <https://github.com/astral-sh/uv/blob/main/README.md>`_
+Install using `uv <https://github.com/astral-sh/uv/blob/main/README.md>`_
 ---------------------
 
 .. code-block:: bash
 
-    uv init myproject
-    uv venv
-    source .venv/bin/activate
-    uv pip install causalml
+    uv init
+    uv add causalml
 
-Install ``causalml`` with ``tensorflow`` for ``DragonNet`` from ``PyPI`` using `uv <https://github.com/astral-sh/uv/blob/main/README.md>`_
+Install ``causalml`` with ``tensorflow`` for ``DragonNet`` using `uv <https://github.com/astral-sh/uv/blob/main/README.md>`_
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 .. code-block:: bash
 
-    uv pip install causalml[tf]
+    uv add "causalml[tf]"
 
-Install ``causalml`` with ``torch`` for ``CEVAE`` from ``PyPI`` using `uv <https://github.com/astral-sh/uv/blob/main/README.md>`_
+Install ``causalml`` with ``torch`` for ``CEVAE`` using `uv <https://github.com/astral-sh/uv/blob/main/README.md>`_
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 .. code-block:: bash
 
-    uv pip install causalml[torch]
+    uv add "causalml[torch]"