Remove developer documentation (#1580)

Remove developer documentation in favor of the developer docs website.

README.md

@@ -1,8 +1,8 @@
 # Home Assistant Operating System
 
-Home Assistant Operating System (formerly HassOS) is an operating system optimized for hosting [Home Assistant](https://www.home-assistant.io) and its [Add-ons](https://www.home-assistant.io/addons/).
+Home Assistant Operating System (formerly HassOS) is a Linux based operating system optimized to host [Home Assistant](https://www.home-assistant.io) and its [Add-ons](https://www.home-assistant.io/addons/).
 
-Home Assistant Operating System uses Docker as Container engine. It by default deploys the Home Assistant Supervisor as a container. Home Assistant Supervisor in turn uses the Docker container engine to control Home Assistant Core and Add-Ons in separate containers. Home Assistant Operating System is **not** based on a regular Linux distribution like Ubuntu. It is built using [buildroot](https://buildroot.org/) and it is optimized for running Home Assistant, especially on single board compute (SBC) devices like the Pi, ODROID, NUC and Tinker Board (see supported hardware below).
+Home Assistant Operating System uses Docker as Container engine. It by default deploys the Home Assistant Supervisor as a container. Home Assistant Supervisor in turn uses the Docker container engine to control Home Assistant Core and Add-Ons in separate containers. Home Assistant Operating System is **not** based on a regular Linux distribution like Ubuntu. It is built using [Buildroot](https://buildroot.org/) and it is optimized to run Home Assistant. It targets single board compute (SBC) devices like the Raspberry Pi or ODROID but also supports x86-64 systems with UEFI.
 
 ## Features
 
@@ -10,7 +10,7 @@ Home Assistant Operating System uses Docker as Container engine. It by default d
 - Minimized I/O
 - Over The Air (OTA) updates
 - Offline updates
-- Modular using Docker
+- Modular using Docker container engine
 
 ## Supported hardware
 
@@ -28,11 +28,17 @@ If you just want to use Home Assistant the official [getting started guide](http
 
 If you're interested in finding out more about Home Assistant Operating System and how it works read on...
 
-## HassOS components
+## Development
+
+If you don't have experience with embedded systems, Buildroot or the build process for Linux distributions it is recommended to read up on these topics first (e.g. [Bootlin](https://bootlin.com/docs/) has excellent resources).
+
+The Home Assistant Operating System documentation can be found on the [Home Assistant Developer Docs website](https://developers.home-assistant.io/docs/operating-system).
+
+### Components
 
 - **Bootloader:**
-  - [Barebox](https://barebox.org/) for devices that support EFI
-  - [U-Boot](https://www.denx.de/wiki/U-Boot) for devices that don't support EFI
+  - [Barebox](https://barebox.org/) for devices that support UEFI
+  - [U-Boot](https://www.denx.de/wiki/U-Boot) for devices that don't support UEFI
 - **Operating System:**
   - [Buildroot](https://buildroot.org/) LTS Linux
 - **File Systems:**
@@ -45,12 +51,6 @@ If you're interested in finding out more about Home Assistant Operating System a
 - **Security:**
   - [AppArmor](https://apparmor.net/) Linux kernel security module
 
-If you don't have experience with these, embedded systems, buildroot or the build process for Linux distributions, then please read up on these topics. The rest of the documentation in this project is for developers and assumes you have experience with embedded systems or a strong understanding of the internal workings of operating systems.
-
-## Developer Documentation
-
-All developer documentation is in the [Documentation](./Documentation) directory.
-
 ### Development builds
 
 The Development build GitHub Action Workflow is a manually triggered workflow