Delete python.markdown (#14041)

I propose we delete this.

* It's not linked from anywhere in the official docs.
* People find it and follow it on random operating systems
* It's a subset of the official Python install docs

source/_docs/installation/python.markdown

@@ -1,30 +0,0 @@
----
-title: "Installation on your computer"
-description: "Installation of Home Assistant on your computer."
-redirect_from: /getting-started/installation-python/
----
-
-<div class='note'>
-
-If you're running a Linux-based platform, we strongly recommend you follow the instructions for a [virtual environment](/docs/installation/virtualenv/) instead.
-
-</div>
-
-Once Python is installed, execute the following code in a console:
-
-```bash
-pip3 install homeassistant
-hass --open-ui
-```
-
-Running these commands will:
-
-- Install Home Assistant
-- Launch Home Assistant and serve the web interface on [http://localhost:8123](http://localhost:8123)
-
-Video tutorials of this process for various operating systems are available here:
-
-- [macOS](https://www.youtube.com/watch?v=hej6ipN86ls)
-- [Ubuntu 14.04](https://www.youtube.com/watch?v=SXaAG1lGNH0)
-
-Keep in mind that the operating systems used and the software releases shown may be outdated.