Remove react burger menu, add new nav menu

[bryanparmelee]

This PR removes the 'react-burger-menu' package, which is seemingly no longer supported and was flooding the console with a large obnoxious error message.

package.json

• remove 'react-burger-menu' and its types from dependencies.

src/components/Header.module.css

• remove header styling that is no longer necessary
• add header wrapper styling to better align stroller logo and new burger menu

src/components/Header.tsx

• remove 'react-burger-menu' and all associated code.
• remove signoutuser method, currentuser context which now live in the NavMenu component
• import new NavMenu component

src/components/NavMenu.module.css

• add styling for new NavMenu component

src/components/NavMenu.module.css

• create new NavMenu component which functions the same as the react-burger-menu without all the errors. Made using MUI's drawer component.