Docs: Delete extra docs for windows builds

This should be visible in icinga.com/docs, no extra
docs needed.

diff --git a/BUILD_WINDOWS.md b/BUILD_WINDOWS.md
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--- a/BUILD_WINDOWS.md
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-# Build Icinga 2 on Windows
-
-The Icinga Project is providing Windows MSI packages under https://packages.icinga.com/windows/
-
-> **Note:**
-> This is a developer documentation on how to build Icinga 2 on Windows!
-
-Also see [INSTALL.md](INSTALL.md) for Linux build instructions.
-
-## Requirements
-
-* 32 or 64-bit system
-* Visual Studio >= 14 2015
-* CMake >= 2.6
-* OpenSSL >= 1.0.1
-* Flex and Bison
-
-## Install Requirements
-
-**Visual Studio**
-
-Download from [visualstudio.com](https://www.visualstudio.com/en/downloads/)
-
-The Community Edition is available for free, and is what we use to build.
-
-Workloads to install:
-* C++ Desktop
-* .NET Desktop
-
-**OpenSSL for Icinga**
-
-See our [openssl-windows GitHub project](https://github.com/Icinga/openssl-windows).
-
-You will need to install a binary dist version to 'C:\\Program Files\\OpenSSL'.
-
-There is a Powershell script to help you downloading: `.\tools\win32\download-openssl.ps1`
-
-**Chocolatey**
-
-A simple package manager for Windows, please see [install instructions](https://chocolatey.org/install).
-
-**Git**
-
-Best to use Chocolatey, see [package details](https://chocolatey.org/packages/git).
-
-```
-choco install git
-```
-
-**Flex / Bison**
-
-Best to use Chocolatey, see [package details](https://chocolatey.org/packages/winflexbison3).
-
-```
-choco install winflexbison3
-```
-
-**CMake**
-
-Best to use Chocolatey, see [package details](https://chocolatey.org/packages/cmake)
-or download from: [cmake.org](https://cmake.org/download/)
-
-```
-choco install cmake
-```
-
-**WIX**
-
-Best to use Chocolatey, see [package details](https://chocolatey.org/packages/wixtoolset).
-
-```
-choco install wixtoolset
-```
-
-**Boost**
-
-Download third party Windows binaries from: [boost.org](http://www.boost.org/users/download/)
-
-For example: `https://dl.bintray.com/boostorg/release/1.65.1/binaries/boost_1_65_1-msvc-14.1-64.exe`
-
-*Warnings:*
-* Must match your Visual Studio version!
-* CMake might not support the latest Boost version (we used CMake 3.10 and Boost 1_65_1)
-
-Run the installer exe.
-
-## Build Icinga 2
-
-Run with VC Native x64 Command Prompt:
-
-```
-powershell .\tools\win32\configure.ps1
-powershell .\tools\win32\build.ps1
-powershell .\tools\win32\test.ps1
-```
-
-See these scripts for details.
-
-## AppVeyor
-
-We are building [Icinga 2 with AppVeyor](https://ci.appveyor.com/project/icinga/icinga2) for testing and CI integration.
-
-Please check `appveyor.yml` for our instructions.