Add local SVG generator script and GitHub Action for trophy SVGs (#412)

* Wrote a simple render_svg.ts file that generates the svg given an github username, theme and out path.

* render_svg.ts generates output dir if not exsists.

* Added Section to README.md that explains how to use the render_svg.ts script.

* Added an github action that utilizes the render_svg.ts script.

* Added Usage of github action to README.md

* Added simple CI Check if action runs.

* Ran: deno fmt