* website: redo mobile nav to use Link and be rid of select input
* fix react className prop
* add zebapy to contributors
* website: upgrade gatsby deps to release candidate
* fix lint
* website: initial conversion to gatsby v2
* fix unexpected history use warning
* use commonjs only to fix gatsby error
* fix gatsby import error with sidecar
* remove unused postcss-colour-functions
* remove unused prop
* lowercase layout filename import to match actual file
* chore(lint): format code
