Combine Zoom and Pan Tools. Homepage additions. And a bug fix

You can now double click with the Pan tool to zoom. I’m considering removing the Zoom tool entirely if this ends up feeling good for folks, so try using the Pan tool and weigh in if you have thoughts on it.

I’ve also added a couple new sessions to the homepage. Most importantly I now share that Shmeppy supports phones and tablets, but I also added a section on Shmeppy’s three traits.

And finally I fixed a small bug on Tablet: using the measure tool with the Eraser activated didn’t work, but now it does!