feat/13-create-404

[vinokishorefp]

• [ ] Created 404 error page
• [ ] Created side navbar
• [ ] Created user page
• [ ] Changed alignment for admin page

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 43075e3):

https://flipopay-ams--pr36-feat-13-creating-404-c0zo5p0a.web.app

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