Remove unnecessary and bloated folders

[m1j09830]

🗣 Description

This PR satisfies issue #10

💭 Motivation and context

Refer to issue #10

🧪 Testing

• Modified vulnerability scan function to remove .cache folder after completion
• Modified default logins function to remove .cache folder after completion
• Removed lines in report generation function that duplicated the removal of the .cache folder
• Reinstalled the tool and verified folders were properly removed and functionality was not impacted

✅ 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 relevant repo and/or project documentation has been updated to reflect the changes in this PR.
• [x] Tests have been added and/or modified to cover the changes in this PR.
• [x] All new and existing tests pass.

✅ Pre-merge checklist

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