Move the search input field to the center of the navbar

[ANicholasson]

Use display: flex or something with "align-self: center" to vertically center the item. Not sure what caused it to move up

https://github.com/AutoPacker-OSS/AutoPacker/blob/6395fd09977396edae91d915dc59c477b8642006/web-application/src/components/Navbar/Navbar.js#L60