Update INSTALL

INSTALL

@@ -8,43 +8,10 @@ Getting the documentation
 ------------------------------
 
 A regularly-updated copy is available at 
-http://assimp.sourceforge.net/lib_html/index.html
+https://assimp-docs.readthedocs.io/en/latest/
-
-A CHM file is included in the SVN repos: ./doc/AssimpDoc_Html/AssimpDoc.chm.
-To build the doxygen documentation on your own, follow these steps:
-
-a) download & install latest doxygen 
-b) make sure doxygen is in the executable search path
-c) navigate to ./doc
-d) and run 'doxygen'
-
-Open the generated HTML (AssimpDoc_Html/index.html) in the browser of your choice.
-Windows only: To generate the CHM doc, install 'Microsoft HTML Workshop'
-and configure the path to it in the DOXYFILE first. 
 
 ------------------------------
 Building Assimp 
 ------------------------------
 
-More detailed build instructions can be found in the documentation,
+Just check the build-instaructions which you can find here: https://github.com/assimp/assimp/blob/master/Build.md
-this section is just for the inpatient among you.
-
-CMake is the preferred build system for Assimp. The minimum required version 
-is 2.6. If you don't have it yet, downloads for CMake can be found on
-http://www.cmake.org/. 
-
-For Unix:
-
-1. mkdir build && cd build
-2. cmake .. -G 'Unix Makefiles'
-3. make -j4
-
-For Windows:
-1. Open a command prompt
-2. mkdir build
-3. cd build
-4. cmake ..
-5. cmake --build .
-
-For iOS:
-Just check the following project, which deploys a compiler toolchain for different iOS-versions: https://github.com/assimp/assimp/tree/master/port/iOS