Fixed flicker problem on index.

- Modifying the webview properties to change the transparent color both
on xml and in code.
- Moved the color setting after the content has been loaded so the
dimensions are already set.
- Found an alternative to the flicker problem by disabling the hardware
acceleration in the manifest.
- Solving issue after disabling the HA where the pager looks slow and
the vertical/horizontal scrolling were buggy.
- Modifying the alpha component of the background color of the webview.
- Found solution with HA enabled and using the software as layer type.