Replaced HTML components with MUI applicable components

[nora-zajzon]

Fixes #1641 and #1640

What changes did you make and why did you make them ?

• Replaced the HTML components with applicable MUI components in ./src/components/auth/HandleAuth.js
• Replaced the HTML components with applicable MUI components in ./src/components/user-admin/EditUsers.js

[github-actions]

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[trillium]

Some UI changes, no functionality changes. We will need to come back to this component and beautify it a little bit but thats fine.

Thank you!

[trillium]

UI changes to the user edit page:

Screenshots

New

Old

It looks like the MUI list item component renders placeholder text differently than the previous setup, we'll need to go back and fix that in a separate issue.

@JackHaeg can I ping you to track that?

[JackHaeg]

@trillium The new issue tracking the MUI list component fix can be found here: #1723