Improved homepage by re-using the cc65.org design.

Copying those design elements was explicitly approved by the original author:
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Date: Mon, 8 Apr 2013 20:31:13 +0200
From: Ullrich von Bassewitz <uz@musoftware.de>
To: cc65@musoftware.de
Subject: Re: [cc65] Copy Web Page Design ?

Hi!

On Mon, Apr 08, 2013 at 12:27:23PM +0200, Oliver Schmidt wrote:
> I'd like to copy the following files
[...]

That's ok, just go ahead. [...]
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