chore: fix broken link in acvm-repo README

[shak58]

Description

Problem*

This pull request resolves the issue with outdated and broken links in the acvm-repo README.md, which can lead to confusion when adding new crates to the workspace.

Summary*

Updated the README.md in acvm-repo to correct the relative paths to Cargo.toml, release-please-config.json, and .release-please-manifest.json. Also updated the incorrect reference from publish.yml to the correct publish-acvm.yml to reflect the current state of the repository workflows.

Additional Context

The previous link to publish.yml was broken, leading to a non-existent file. The updated links reference the documentation accurately.

Documentation*

• [ ] No documentation needed.
• [x] Documentation included in this PR.
• [ ] [Exceptional Case] Documentation to be submitted in a separate PR.

PR Checklist*

• [x] I have tested the changes locally.
• [x] I have formatted the changes with Prettier and/or cargo fmt on default settings.