add script generate-fonts

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This PR adds a folder generate-fonts under scripts/ that contains a small Node JS project that generates ttf and woff2 fonts for the assets in this project.

SEE #16

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@microsoft-github-policy-service agree

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It does not generate font files for the 3D variant because there are no .svg files for that variant.

It also does not generate font files for the Color variant, because when I try to do so I encounter an error:

Error: Got an error parsing the glyph "alien": Unexpected character "N" at index 1. Command cannot follow comma.

Alien is not the first glyph, so in principle Color can work, but I cannot easily make it skip a glyph in case of errors. I am not sure whether the alien glyph is an exception or whether there are many glyphs with this problem in the Color set. That would need some further investigation.