Tidy up repo, add PR template

[irithsharma]

Justification

Combining/tidying up small changes to repo + adding a default template for PRs to ensure consistency.

Major changes

• Adding a PR template to be filled out whenever changes need to be merged in.

Minor changes

• Remove ls command from pipeline
• Add __init__.py to src
• Update the README bash snippets to be directly copyable.

Effects

• The pipeline should not output directory info from now on.
• All PRs will come with a template to fill out in order to be reviewed.

---

• [x] Linked relevant ticket, or provided justification for change
• [x] Code is commented/documented well to ensure readability.
• [ ] Unit testing:
  • [ ] Implemented/updated.
  • [ ] Run locally without any failures.
  • [ ] Run in PR pipeline without any failures.
• [ ] Integration testing
  • [ ] Implemented/updated.
  • [ ] Run locally without any failures.
  • [ ] Run in PR pipeline without any failures.
• [ ] Linter scan for branch has no new issues and tests introduce > 80% coverage.
• [x] Release
  • [x] Author of PR is available during deployment time to monitor release.