add instructions for previewing changes
add instructions for previewing changes

austinjavascript/austinjavascript.github.io,austinjavascript/austinjavascript.github.io,austinjavascript/austinjavascript.github.io,lawnsea/austinjavascript.github.io,lawnsea/austinjavascript.github.io,lawnsea/austinjavascript.github.io,lawnsea/austinjavascript.github.io,austinjavascript/austinjavascript.github.io,lawnsea/austinjavascript.github.io,austinjavascript/austinjavascript.github.io