improve mpi_max drawing

lectures/hardware/slides.qmd

@@ -128,7 +128,7 @@ If we want to scale beyond one node, what do we need in our example?
 ```C++
 int MPI_Reduce(void* sendbuf, void* recvbuf, int count, 
                MPI_Datatype datatype, 
-               MPI_Op op,   // MPI_SUM, MPI_MAX, ...
+               MPI_Op op,   // MPI_MAX, ...
                int root, 
                MPI_Comm comm)  
 ```
@@ -136,18 +136,10 @@ int MPI_Reduce(void* sendbuf, void* recvbuf, int count,
 <br>
 
 :::fragment
-![](static/reduce.jpg){.nostretch fig-align="center" width="70%"}
-
-:::{.info .smaller}
-MPI_MAX for 4 ranks and count=2
-:::
-
+![](static/reduce.svg){.nostretch fig-align="center" width="50%"}
 :::
 
 
-
-
-
 ## Hands-on Session! {background-color=var(--dark-bg-color) .leftalign}
 1. Get the example code from [TODO- new link to MPI code]