fix URL

update .gitignore

update package.json

Correct format() in source-serif-variable.css

update LICENSE.md

Update font files to version 4.005

Update LICENSE.md

Add .gitignore

Updated styles.css - normal font is 400

Update readme to include link to SS4 blog post

Edit README.md

remove single comma from package.json

Update font files to version 4.004

Update README.md

Update README.md