Update examples install instructions (#221)

* Update examples install instructions

* Update install_from_pypi.rst

* Update install_from_pypi.rst

Author: VanDavv

docs/source/includes/install_from_pypi.rst

@@ -1,11 +1,12 @@
-Please run the following command to install the required dependencies
+Please run the `install script <https://github.com/luxonis/depthai-python/blob/main/examples/install_requirements.py>`__
+to download all required dependencies. Please note that this script must be ran from git context, so you have to download the `depthai-python <https://github.com/luxonis/depthai-python>`__ repository first and then run the script
 
 .. code-block:: python
    :substitutions:
 
-    python3 -m pip install -U pip
-    python3 -m pip install opencv-python
-    python3 -m pip install -U --force-reinstall depthai
+   git clone https://github.com/luxonis/depthai-python.git
+   cd depthai-python/examples
+   python3 install_requirements.py
 
 
-For additional information, please follow :ref:`installation guide <Installation>`
+For additional information, please follow :ref:`installation guide <Installation>`