style(.yaspellerrc) update spelling
style(.yaspellerrc) update spelling

- Update capitalization from AirBNB to Airbnb
- Remove duplicate SASS item from the config

Reason for the change:
- Official spelling of the brand name has changed

SC5/sc5-styleguide,varya/sc5-styleguide,SC5/sc5-styleguide,junaidrsd/sc5-styleguide,patriziosotgiu/sc5-styleguide,patriziosotgiu/sc5-styleguide,varya/sc5-styleguide,junaidrsd/sc5-styleguide