Template "Empty" #616

For those people who already know Remotion, it might be useful to skip the "Hello World" and start with an "Empty" template. This template should be the default Typescript template but a blank Canvas.

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Approval criteria for this PR:

• Make a new repo, template-still, which should contain the same code as https://github.com/remotion-dev/template-helloworld
• Remove the Hello World code and only have 1 composition, 1280x720 and empty.
• Remove the SSR code and dependencies.
• Adapt the README if necessary.
• Transfer the repo to the remotion-dev organization.
• Make a PR to add it to the list of templates.