Ci/234 pr validation

[mijinummi]

Enforce PR Title Convention & Description Requirements (#234)

Problem

• Contributors submit PRs with vague titles (update) or minimal descriptions (Closes #22).
• This slows reviews and pollutes commit history.

Solution

• Added validate-pr job in .github/workflows/ci-cd.yml.
• Updated build-and-deploy job to depend on validation.
• Updated CONTRIBUTING.md with clear PR standards.

Acceptance Criteria

• ✅ PR titles follow Conventional Commits style.
• ✅ PR descriptions provide context (≥20 chars).
• ✅ CI blocks non-compliant PRs.
• ✅ Contributors informed via updated guidelines.

Testing

• PR with title update → fails validation.
• PR with description Closes #22 → fails validation.
• PR with title fix(auth): handle expired tokens (#250) and detailed description → passes validation.
  Closes Enforce PR Title Convention & Description Requirements in CI/CD Pipeline #234

[phertyameen]

Make a pull request please. Some important changes were made. these checks oughtt to pass immediately after