Add mermaid for rendering graphs and other diagrams

content/ceph-benchmarking/index.md

@@ -39,6 +39,14 @@ Setup the benchmark itself:
 5. `mount /dev/rbd0 /mnt/bench`
 
 ## Benchmarks
+{% mermaid() %}
+xychart
+    title "Random Read"
+    x-axis "Block Size" ["4k", "8k", "4M", "8M"]
+    y-axis "IOPS" 0000 --> 5000
+    bar [0, 0, 0, 0]
+
+{% end %}
 
 ## TODO
 - Try directly on the block device