Add Version Number to Footer (CRASM-821)

[hawkishpolicy]

Added .env based Version Number to Footer component.

🗣 Description

• Created .env variable to store version number.
• Added version number beside logo in footer.

💭 Motivation and context

• Closes CRASM-821

🧪 Testing

📷 Screenshots (if appropriate)

✅ Pre-approval checklist

• [x] This PR has an informative and human-readable title.
• [x] Changes are limited to a single goal - eschew scope creep!
• [x] All future TODOs are captured in issues, which are referenced in code comments.
• [x] All relevant type-of-change labels have been added.
• [x] I have read the CONTRIBUTING document.
• [x] These code changes follow cisagov code standards.
• [x] All new and existing tests pass.

✅ Pre-merge checklist

• [ ] Revert dependencies to default branches.
• [ ] Finalize version.

✅ Post-merge checklist

• [ ] Create a release.