Create "Sync Snippets Across Multiple Devices Using Github"

[jwafu]

Creating this new page for the docs site on syncing snippets. Going to be added to the Highlights and Benefits section.

• [ ] pull over new copy from: https://docs.google.com/document/d/1c1tlegi37S8uHrR-tWi31kcgG4t0UHwkO5jjpcmRH-Y/edit
• [ ] ensure images and gif make it over