Minor updates to README.md

Removed some language about the old mailing list, pointed to forums,
and more accurately to the
wiki, updated reference to SDL.
Zardoz speaks to you, His chosen ones.

README.md

@@ -36,11 +36,15 @@ use a modern copy from http://icculus.org/gtkradiant/.
 
 The original id software readme that accompanied the Q3 source release has been
 renamed to id-readme.txt so as to prevent confusion. Please refer to the
-web-site for updated status.
+website for updated status.
 
-More documentation is on:
+More documentation including a Player's Guide and Sysadmin Guide is on:
 http://wiki.ioquake3.org/
 
+If you've got issues that you aren't sure are worth filing as bugs, or just
+want to chat, please visit our forums:
+http://discourse.ioquake.org
+
 # Compilation and installation
 
 For *nix
@@ -481,6 +485,7 @@ The focus for ioq3 is to develop a stable base suitable for further development
 and provide players with the same Quake 3 experience they've had for years.
 
 We do have graphical improvements with the new renderer, but they are off by default.
+See opengl2-readme.md for more information.
 
 # Building Official Installers
 
@@ -503,13 +508,11 @@ but we have some general guidelines:
     providing pak0.pk3 and the patch pk3s are not referred to or included in the
     installer.
 
-  * Please include at least an SDL so/dylib/dll on every platform.
+  * Please include at least a libSDL2 so/dylib/dll on every platform.
 
   * Please include an OpenAL so/dylib/dll, since every platform should be using
     it by now.
 
-  * Please contact the mailing list when you've made your installer.
-
   * Please be prepared to alter your installer on the whim of the maintainers.
 
   * Your installer will be mirrored to an "official" directory, thus making it