Fix vulnerability issue and simplify the setup

cssconf / cssconf.org

The home of the CSSconf event family

http://cssconf.org/

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Closed lukaszklis closed 6 years ago

lukaszklis commented 6 years ago

Things done in this PR:

Fix the vulnerability issue mentioned by GitHub
Removed the compass dependency since the only thing we needed was a CSS reset
Specified the minimum Ruby version required to run the site (picked the latest one due to security reasons, etc.)