added instruction message on load for UX clarity

changed footer font and icon size

fixed linkedin bug

changed linked in img

changed linkedIn image url

added footer logo, close nav bar on selection

set up different css files for responsive design

Merge pull request #1 from fdefay00/dev

added logic for responsiveness. mobil design done. desktop design in progress

added opening/closing sidebar for mobile devices

adds spinner on search, fixes duplicate bug

added polyfills for ResizeObserver to support older safari and IOS browser

add heroku postbuild script to run webpack in prod

set up prod keys and dev keys logic

deployment debugging