Teach deploy script to keep repo cleaner

Use `git rm` instead of `rm` to remove old deploy files and dirs from
index.
Merge branch 'deploy-no-garbage'
Stop using arbitrary width/height on container

Set width to `100%` so it takes up the whole screen (minus margin and
padding in the user agent stylesheet).

Don't set height to anything. Will consider height more later.
Add SVG treble clef from Wikimedia Commons

Source: http://commons.wikimedia.org/wiki/File:Treble_Clef_without_line.svg
Remove unneeded tags/attrs of treble clef SVG
Convert treble clef SVG to React component

And render it from the staff component, not at all positioned or scaled
properly yet.
Add `scale` prop to the `TrebleClef` component

Defaults to `1` to render at its natural size. Set to `0.5` to render at
half size. Etc.
Add spacing above staff to fully show treble clef

The treble clef was getting cut off at the top. Add spacing above
staff so that it's fully visible.