Adjusted for 16:9 aspect ratio, improved Git demonstration

For EWASS, they recommended a 16:9 aspect ratio. This is becoming the
standard and after some tests, I saw felt that it does indeed show
better on modern monitors while also giving more horizontal space. The
slides are now changed to this aspect ratio and everything was
slightly modified to show nicely in it.

Also, an extra step was added to the Git demonstration steps to show
how progress on the project branch happens independently of progress
on the template.

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