Links to playground run go to not new Playground

[i582]

At the moment, they lead to not new Playground, which personally does not work for me, and most importantly, when I click Run near the script, I want it to open in the editor, and not the standard Hello World code.

V has a new Playground (https://play.vlang.io), and once vlang/playground#10 is merged, it will be possible to link to the code.

After that, links to the Playground should be replaced with the correct ones.