chore: update repo URLs to VecGrep org

[iamvirul]

Pull Request

Type of Change

• 🔧 Chore (build process, CI/CD, dependency updates)

Description

Updates all hardcoded iamvirul/VecGrep URLs to VecGrep/VecGrep following the repository transfer to the VecGrep organization.

Related Issues / PRs

N/A

Changes Made

• README.md — updated all badge and link URLs to point to VecGrep/VecGrep
• pyproject.toml — updated [project.urls] (Homepage, Repository, Issues)

Checklist

• My code follows the project's style guidelines (ruff passes)
• I have performed a self-review of my own code
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

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