📝(frontend) propose a condensed version of the frontend README

[olaurendeau]

Purpose

Trying to make the onboarding of frontend developers a bit easier

Proposal

• Condensed README exposing all necessary commands
• New Make commands to run e2e tests locally

External contributions

Thank you for your contribution! 🎉

Please ensure the following items are checked before submitting your pull request:

• I have read and followed the contributing guidelines
• I have read and agreed to the Code of Conduct
• I have signed off my commits with git commit --signoff (DCO compliance)
• I have signed my commits with my SSH or GPG key (git commit -S)
• My commit messages follow the required format: <gitmoji>(type) title description
• I have added a changelog entry under ## [Unreleased] section (if noticeable change)
• I have added corresponding tests for new features or bug fixes (if applicable)