docs: add heliodor as a contributor for ideas, and bug

[allcontributors[bot]]

Adds @heliodor as a contributor for ideas, bug.

This was requested by vnugent in this comment

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[vercel[bot]]

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1 Ignored Deployment

| Name | Status | Preview | Updated (UTC) | | :--- | :----- | :------ | :------ | | **open-tacos** | ⬜️ Ignored ([Inspect](https://vercel.com/openbeta-dev/open-tacos/48MuZ2Ak4kRastH7hyzPBJ4PiQfv)) | [Visit Preview](https://open-tacos-git-all-contributors-add-heliodor-openbeta-dev.vercel.app) | Jan 24, 2024 6:51pm |