[Frontend] - Move Remaining CSS Files to Stylesheets Folder

[anthonybernardi]

Description

765 took out almost all of the css files in the frontend. Now lets move them all to a stylesheets folder.

The reasoning for this is that if we do this and then move all the tests out in a separate ticket, we can get rid of all the folders in the frontend and just make them files. For example, instead of having a folder src/frontend/components/action-button/ where the folder contains action-button.tsx, action-button.module.css, and action-button.test.tsx, it would just become src/frontend/components/action-button.tsx (this ticket only involves the css part though)

Background

need to know how to move files and change imports

Proposed Solution

1. create a folder called stylesheets in the path src/frontend/stylesheets
2. for each remaining css file, move it to the stylesheets folder
3. make sure that the import gets updated, either automatically by vscode or manually

Mocks

No response