Release 1.0.0

Adds new icons. #1

- motorcycle-bobber
- motorcycle-cafe-racer
- motorcycle-chopper
- motorcycle-trike
- utv-sport
- gas-tank
- chain
- air-filter

Updates motorcycle-cruiser and motorcycle-adventure icons.
Changes favicon to engine-v-twin.
Recompresses release 1.0.0 ZIP.
Updates social share image.