Document why "kobwebStart" vs "jsRun"

[bitspittle]

Short version: It's possible my Gradle fu is not good. I needed a way to run a task that starts a server but then doesn't run forever (so, e.g., I could run the server and then call kobwebBuild next).

Also, my custom server supports better feedback for livereloading vs. webpack which does not (as far as I can tell)