Shell updates (bonds, updated Dapps) (#6897)

* Remove stage-0

* Re-add stage-0 for `export default from './xyz';`

* Add background loading image

* Add window.isParity for parity-specific actions

* inject bonds (temporary)

* Remove loading text overlay

* Remove background around logo

* Remove debug log

* Fix account selection (correct component used)

* Update with changed dapp dependencies

* Add oo7 to list of babel node_module targets

* injectObjects -> onDappLoad