Fix/knapsack appshell

[owilliams320]

Description

Adjusting the styles of our app shell component to render correctly in a knapsack example

What's included?

• small style adjustments to app shell
• small addition to ks-overrides.css
• removed unused package in package.json

Test Steps

• npm run knapsack
• then go to the URL provided by the terminal
• finally go to the app shell page under components and test the app shell component

General Tests for Every PR

• npm run start still works.
• npm run lint passes.
• npm run stylelint passes.
• npm test passes and code coverage is not lower.
• npm run build still works.

Before

After