assets: Use scaled 'my-face.png'

Reduce the image size to 220x220px.
index: Remove unnecessary image size tags

Images are shown at their original sizes.
assets: Fix styles.css indentation
styles: Fade in arrows

Adds a css animation to fade in the arrows on page load. Ideally, I
would like this to be slower and with a delay before beginning, however
the hover transition interrupts this, so it is necessary to pick a
suitably short animation time that it won't likely be interrupted by the
mouse.
assets: Fix partial impress.js.in

The impress.js.in asset was corrupt. This fixes that.
assets/styles.css: Tidy arrows styles
assets/styles.css: Reduce opacity of inactive steps
assets/styles.css: Minor code style fixes
index: Remove unneeded 'linkstrip' div
assets/impress.js: Disable tab key binding

Sorry Bartek, I know you have your reasons, but Tab control is
irritating and broken.
Overhaul CSS styling

Now that impress.js isn't broken...
index: Open blog link in new window