Update figs

Signed-off-by: Rafael Ravedutti <rafaelravedutti@gmail.com>

README.md

@@ -7,10 +7,9 @@ It aims at covering all available state-of-the-art algorithms from different com
 
 Besides, many tools to study and evaluate the in-depth performance of such kernels on distinct hardware are made available like the gather-bench which is a benchmark to mimic the data movement from such kernels and the stubbed force calculation cases used to isolate the impacts caused by memory latencies and control flow divergence.
 
-![Image](figures/verlet_v2.pdf "Verlet Lists")
-![Image](figures/gromacs_mxn_v2.pdf "GROMACS MxN")
+![Image](figures/verlet_v2.png "Verlet Lists") ![Image](figures/gromacs_mxn_v2.png "GROMACS MxN")
 
-![Image](figures/stub_new_v3.pdf "Stubbed cases")
+![Image](figures/stub_new_v3.png "Stubbed cases")
 
 ## Build instructions
 
@@ -76,7 +75,7 @@ The default behavior and other options can be changed using the following parame
 
 ## Citations
 
-R. Ravedutti Lucio Machado, J. Eitzinger, H. Köstler, and G. Wellein: MD-Bench A generic proxy-app toolbox for state-of-the-art molecular dynamics algorithms. Accepted for [PPAM](https://ppam.edu.pl/) 2022, the 14th International Conference on Parallel Processing and Applied Mathematics, Gdansk, Poland, September 11-14, 2022. PPAM 2022 Best Paper Award. Preprint: [arXiv:2207.13094](https://arxiv.org/abs/2207.13094)
+R. Ravedutti Lucio Machado, J. Eitzinger, H. Köstler, and G. Wellein: MD-Bench: A generic proxy-app toolbox for state-of-the-art molecular dynamics algorithms. Accepted for [PPAM](https://ppam.edu.pl/) 2022, the 14th International Conference on Parallel Processing and Applied Mathematics, Gdansk, Poland, September 11-14, 2022. PPAM 2022 Best Paper Award. Preprint: [arXiv:2207.13094](https://arxiv.org/abs/2207.13094)
 
 ## Credits