Thumbor visual editor

Hi folks,

I kept going back to the docs to get thumbor URLs right (segment order, filter arguments, how fit-in interacts with fill()), so I built something to do it visually:

https://tlgimenes.github.io/thumbor-url-explorer/

You paste a URL, it splits it into editable parts and rebuilds it as you type. Pointed at your own thumbor, it shows the result next to the original. It covers the filters from the docs, lets you drag to reorder them, and you can drag a box on the source image to get crop or focal() coordinates.

If you guys want, we can work to put a version of this into the docs.

Hope it's useful to someone.