Change vertex buffer handling

Previously vertex data was only in shaders. I have removed it from there
and put hardcoded vertex data into cpp source code.

include/vulkanBase.hpp

@@ -16,9 +16,25 @@
 namespace rse::graphics::vulkanbase
 {
 
+/**
+ * @brief Initialize Vulkan backend
+ *
+ * @return uint8_t 0 on success. Status code on failure
+ */
+
+
 uint8_t initVulkan();
+
+/**
+ * @brief Deinitialize Vulkan backend
+ *
+ */
 void deinitVulkan();
 
+/**
+ * @brief Draw frame on the screen.
+ *
+ */
 void drawFrame();
 
 } /* namespace rse::graphics::vulkanbase */