fix: [M3-7192] - Account Users Add A User Button Alignment

[bnussman-akamai]

Description 📝

• Fixes styles on the http://localhost:3000/account/users page 🎨
• Removes tons of unused styled 🗑️

Preview 📷

Before	After

How to test 🧪

• Go to http://localhost:3000/account/users and check the UI in general
• Check the styles and positioning of the Add A User button

[bnussman-akamai]

I decided not to add any additional padding on mobile viewports because

• it would require one-off styling
• other headers like our main "LandingHeader" do not apply any padding on mobile viewports to the primary button (see below)

Before	After

[cpathipa]

LGTM! Verified the alignment of Add A User button.
Not related to this PR, I noticed that the 'Maintenance' tab's 'Download CSV' button link also has some padding and is not aligned like the 'Add A User' button.

[bnussman-akamai]

Fair point. The Download CSV button is technically aligned, it is just a secondary button with the ripple disabled, making it seem misaligned

[carrillo-erik]

Sweet, nice refactor removing the old styles it definitely helps to reduce the lines of code per file. I was able to inspect the button alignment by running your PR on my local machine.