Documentation links are broken

[heysokam]

The documentation points to the wrong files for reference, after moving from personal-repo to organization-monorepo to standalone.

zmath/README.md

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Documentation can be found [here](https://github.com/zig-gamedev/zmath/blob/main/src/zmath.zig).

zmath/src/root.zig

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// https://github.com/michal-z/zig-gamedev/tree/main/libs/zmath

zmath/src/root.zig

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/// https://github.com/michal-z/zig-gamedev/tree/main/libs/zmath