SVG heap graph inconvenient for color blind

### What version of pprof are you using?

Pprof from Go 1.20.

### What operating system and processor architecture are you using?

MacOS with M2 proccessor.

### What did you do?

Analyzing SVG graph of heap.

### What did you expect to see?

Convenient, understandable colors, e.g. Red-Blue color schema.

### What did you see instead?

Indistinguishable Red-Green color schema.

### From my side

There are an estimated 300 million people in the world with color vision deficiency. 1 in 12 men are color blind (8%). 1 in 200 women are color blind (0.5%). It is significant. Please thing about changing the color schema to get rid of red-green differences.