(Cargo.toml): Fix homepage URL everywhere

Daniel Silverstonerequested to merge
fix-homepage into main

Description

This fixes the homepage URL in our Cargo.toml to https://subplot.tech/

Closes #290 (closed)

Checklist

  • You have read, and followed the guidance in, the CONTRIBUTING guide
  • The MR content has run through a pipeline, or at least has pipelines enabled.
  • There are no licence concerns with this contribution (The README clearly states Subplot is MIT-0)

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