CMake: Update some of the cmake/* docs

cmake/README.md

@@ -3,17 +3,10 @@ Building with CMake
 
 The quickest way to build and install panda with CMake is to run:
 ```sh
-cmake .
-make
-[sudo] make install
-```
-
-Instead, it is recommended to create a separate directory to build Panda3D:
-```sh
-mkdir build
-cd build/
+mkdir build && cd build
 cmake ..
 make
+[sudo] make install
 ```
 
 To configure CMake, it is recommended to use cmake-gui (`cmake-gui .`),

cmake/TODO

@@ -1,4 +0,0 @@
-# List of things which may appear done but actually still need work!
-Test Miles Sound System support
-Add DirectX support for Nvidia Cg
-Finish Config.pp conversion to Config.cmake