Moved raylib webpage to docs folder

raylib webpage has been completely reorganized and moved from gh-pages
(a pain to work with) to docs folder. Useless libs have been removed,
webs have been renamed, etc.

Now it would be easier (hopefully) to update webpage. :)

docs/cheatsheet/raylib_shaders.c

@@ -0,0 +1,34 @@
+
+    // Shader loading/unloading functions
+    Shader LoadShader(char *vsFileName, char *fsFileName);                                              // Load a custom shader and bind default locations
+    void UnloadShader(Shader shader);                                                                   // Unload a custom shader from memory
+    Shader GetDefaultShader(void);                                                                      // Get default shader
+    Shader GetStandardShader(void);                                                                     // Get standard shader
+    Texture2D GetDefaultTexture(void);                                                                  // Get default texture
+
+    // Shader access functions
+    int GetShaderLocation(Shader shader, const char *uniformName);                                      // Get shader uniform location
+    void SetShaderValue(Shader shader, int uniformLoc, float *value, int size);                         // Set shader uniform value (float)
+    void SetShaderValuei(Shader shader, int uniformLoc, int *value, int size);                          // Set shader uniform value (int)
+    void SetShaderValueMatrix(Shader shader, int uniformLoc, Matrix mat);                               // Set shader uniform value (matrix 4x4)
+    void SetMatrixProjection(Matrix proj);                                                              // Set a custom projection matrix (replaces internal projection matrix)
+    void SetMatrixModelview(Matrix view);                                                               // Set a custom modelview matrix (replaces internal modelview matrix)
+
+    // Shading beegin/end functions
+    void BeginShaderMode(Shader shader);                                                                // Begin custom shader drawing
+    void EndShaderMode(void);                                                                           // End custom shader drawing (use default shader)
+    void BeginBlendMode(int mode);                                                                      // Begin blending mode (alpha, additive, multiplied)
+    void EndBlendMode(void);                                                                            // End blending mode (reset to default: alpha blending)
+    
+    // Light creation/destruction functions
+    Light CreateLight(int type, Vector3 position, Color diffuse);                                       // Create a new light, initialize it and add to pool
+    void DestroyLight(Light light);                                                                     // Destroy a light and take it out of the list
+    
+    // VR control functions
+    void InitVrDevice(int vrDevice);                                                                    // Init VR device
+    void CloseVrDevice(void);                                                                           // Close VR device
+    bool IsVrDeviceReady(void);                                                                         // Detect if VR device is ready
+    bool IsVrSimulator(void);                                                                           // Detect if VR simulator is running
+    void UpdateVrTracking(Camera *camera);                                                              // Update VR tracking (position and orientation) and camera
+    void ToggleVrMode(void);                                                                            // Enable/Disable VR experience (device or simulator)
+