docs: pycairo now has wheels (#517)

BREAKING CHANGE: May break for users using scripts/pycairoinstall.py

Author: naveen521kk

docs/source/installation/win.rst

@@ -18,43 +18,6 @@ You can install manim very easily using chocolatey, by typing the following comm
 
 And then you can skip all the other steps and move to installing :ref:`latex-installation`.
 
-Cairo installation
-******************
-
-1. Visit the `Download Page
-   <https://www.lfd.uci.edu/~gohlke/pythonlibs/#pycairo>`_.
-
-2. Select the download that corresponds to your PC's architechture and Python
-   Version
-
-   .. image:: ../_static/windows_cairo.png
-       :align: center
-       :width: 400px
-       :alt: windows cairo download page
-
-   .. note:: ``cp38`` corresponds to Python 3.8, ``cp37`` corresponds to Python
-             3.7, etc. ``win_amd64`` corresponds to 64-bit machines, ``win32``
-             corresponds to 32-bit machines.
-
-3. Open up your command prompt by hitting the Win key and typing ``cmd``.
-
-4. Enter the directory where you want to install cairo by typing ``cd
-   C:\path\to\cairo`` with the path being where you downloaded the ``.whl``
-   file in step 2.
-
-5. Finally, run ``pip(pyversion) install (cairo-file).whl``, where
-   ``pyversion`` is the python version you are using.  For example, if you are
-   using python3.7, you should run ``pip3.7 install (cairo-file).whl``.
-
-
-6. Alternatively, running the command below installs pycairo.  This needs to be
-   run in an elevated command prompt like Powershell.
-
-   .. code-block:: bash
-
-      (Invoke-WebRequest -Uri https://raw.githubusercontent.com/ManimCommunity/manim/master/scripts/pycairoinstall.py -UseBasicParsing).Content | py -3
-
-
 FFmpeg installation
 *******************