Tweaking documentation for the SDL 3.0 preview release

docs/README-git.md

@@ -1,19 +0,0 @@
-git
-=========
-
-The latest development version of SDL is available via git.
-Git allows you to get up-to-the-minute fixes and enhancements;
-as a developer works on a source tree, you can use "git" to mirror that
-source tree instead of waiting for an official release. Please look
-at the Git website ( https://git-scm.com/ ) for more
-information on using git, where you can also download software for
-macOS, Windows, and Unix systems.
-
-    git clone https://github.com/libsdl-org/SDL
-
-If you are building SDL via configure, you will need to run autogen.sh
-before running configure.
-
-There is a web interface to the Git repository at:
-	http://github.com/libsdl-org/SDL/
-

docs/README-hg.md

@@ -1,7 +0,0 @@
-Mercurial
-======
-
-We are no longer hosted in Mercurial. Please see README-git.md for details.
-
-Thanks!
-

docs/README.md

@@ -4,9 +4,8 @@ https://www.libsdl.org/
 
 Simple DirectMedia Layer is a cross-platform development library designed
 to provide low level access to audio, keyboard, mouse, joystick, and graphics
-hardware via OpenGL and Direct3D. It is used by video playback software,
-emulators, and popular games including Valve's award winning catalog
-and many Humble Bundle games.
+hardware. It is used by video playback software, emulators, and popular games
+including Valve's award winning catalog and many Humble Bundle games.
 
 SDL officially supports Windows, macOS, Linux, iOS, and Android.
 Support for other platforms may be found in the source code.
@@ -17,32 +16,40 @@ available for several other languages, including C# and Python.
 This library is distributed under the zlib license, which can be found
 in the file "LICENSE.txt".
 
+Information on building SDL with CMake is available in [README-cmake.md](README-cmake.md)
+
 The best way to learn how to use SDL is to check out the header files in
 the "include" subdirectory and the programs in the "test" subdirectory.
 The header files and test programs are well commented and always up to date.
 
+Information on reporting bugs and contributing is available in [README-contributing.md](README-contributing.md)
+
 More documentation and FAQs are available online at [the wiki](http://wiki.libsdl.org/)
 
-- [Android](README-android.md)
-- [CMake](README-cmake.md)
-- [DynAPI](README-dynapi.md)
-- [Emscripten](README-emscripten.md)
-- [GDK](README-gdk.md)
-- [Git](README-git.md)
-- [iOS](README-ios.md)
-- [Linux](README-linux.md)
-- [macOS](README-macos.md)
-- [Supported Platforms](README-platforms.md)
+- [High DPI Support](README-highdpi.md)
+- [main()](README-main-functions.md)
 - [Porting information](README-porting.md)
-- [PSP](README-psp.md)
-- [PS2](README-ps2.md)
-- [Raspberry Pi](README-raspberrypi.md)
+- [Migrating from SDL 2.0](README-migration.md)
+- [Supported Platforms](README-platforms.md)
 - [Touch](README-touch.md)
 - [Versions](README-versions.md)
-- [Windows](README-windows.md)
-- [WinRT](README-winrt.md)
+- [Visual Studio](README-visualc.md)
+
+- [Android](README-android.md)
+- [Emscripten](README-emscripten.md)
+- [iOS](README-ios.md)
+- [KMSDRM support on BSD](README-kmsbsd.md)
+- [Linux](README-linux.md)
+- [macOS](README-macos.md)
+- [Nintendo 3DS](README-n3ds.md)
+- [PS2](README-ps2.md)
+- [PSP](README-psp.md)
 - [PSVita](README-vita.md)
-- [Nokia N-Gage](README-ngage.md)
+- [Raspberry Pi](README-raspberrypi.md)
+- [RISC OS](README-riscos.md)
+- [Windows GDK](README-gdk.md)
+- [Windows UWP](README-winrt.md)
+- [Windows](README-windows.md)
 
 If you need help with the library, or just want to discuss SDL related
 issues, you can join the [SDL Discourse](https://discourse.libsdl.org/),