[Doc] Replace SVG Figures with PNG due to some format issues (#4)

* update readme

* center and resize benchmark figures

* replace svg figures with PNG

* replace svg figures with png

* remove svg, and add png

README.md

@@ -6,7 +6,7 @@
 
 Tile Language (**tile-lang**) is a concise domain-specific language designed to streamline the development of high-performance GPU/CPU kernels (e.g., GEMM, Dequant GEMM, FlashAttention, LinearAttention). By employing a Pythonic syntax with an underlying compiler infrastructure on top of [TVM](https://tvm.apache.org/), tile-lang allows developers to focus on productivity without sacrificing the low-level optimizations necessary for state-of-the-art performance.
 
-<img src=./images/MatmulExample.svg />
+<img src=./images/MatmulExample.png />
 
 ## Tested Devices
 Although tile-lang aims to be portable across a range of Devices, it has been specifically tested and validated on the following devices: for NVIDIA GPUs, this includes the H100 (with Auto TMA/WGMMA support), A100, V100, RTX 4090, RTX 3090, and RTX A600; for AMD GPUs, it includes the MI250 (with Auto MatrixCore support) and the MI300X (with Async Copy support).