Fix/move fonts outside dirs

[sstruemph]

Changes proposed in this pull request

To streamline font management this PR moves the sample project fonts to the top level of assets/font. This matches the functionality of the Create Theme Block.

This PR moves the sample project fonts to assets/fonts/ instead of storing the fonts in their own directories inside of assets/fonts assets/fonts/din-pro/`. The theme.json file is updated with the new file path.

Closes https://app.asana.com/0/1203895219649773/1206518703604971/f

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Testing

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1. Pull this branch to a local site and verify the fonts are loading correctly.

Functional tests

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• The fonts should load and are moved to the top level of assets/fonts

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