Fix dev API link in README.md

[AetherUnbound]

Fixes

Addresses an issue brought up in #901

Description

This PR fixes the link to the dev API documentation so it points at the API rather than the frontend docs.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.

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[github-actions]

API Developer Docs Preview: Ready

https://wordpress.github.io/openverse-api/_preview/940

Please note that GitHub pages takes a little time to deploy newly pushed code, if the links above don't work or you see old versions, wait 5 minutes and try again.

You can check the GitHub pages deployment action list to see the current status of the deployments.

[dhruvkb]

Nice! I wonder how many people got misled by this.