Release v8.0.0-RC1

Add a sample package.json with basic Parcel commands (#2227), (231e047)

Add sample Open Graph metadata (#2235)
Update Modernizr to 3.11.2 (84ae9cc)
Remove jQuery (#2225)
Set anonymizeIp to true in Google Analytics snippet (#2219)
Update main.css to 2.1.0 (#2234)
Remove Browser Upgrade Prompt (23c4112)
Docs updates (#2251), (#2253), (#2245), (#2220)