New feature: skip to move with url

[bugcat]

Lets update the Shortcuts Docs!

Inspired by the revelation here The all-in-one democratic game. [The game] that you can use custom strings of 3 characters by holding ‘shift’ and clicking the board while on the Letter analysis tool. It makes me feel like there must be so many tricks that I’m missing out on! If you know any maybe we can collect them here and push an update to the documentation here https://github.com/online-go/online-go.com/wiki/Advanced-Tips-&-Tricks#keyboard-shortcuts Basically if you know of any tricks/tip…