PG Build: consolidated "Collaborating" and "Hydration" content

Conflicts:
	docs-phonegap/en/edge/guide/phonegap-build/index.md
downsized screen shot
PG Build: bootstrap 'Debugging' & 'Custom Debug Server' content
PG Build Debug content; replaced Hardeep's demo w/default app's
new screen shot displaying class-toggling in console