Update for Alfred 5 User Configuration

[vitorgalvao]

• Uses Alfred 5 User Configuration instead of Workflow Environment Variables.
• Rewrites the About to support images.
• Makes search keywords configurable by users.
• Uses with input as argv (recommended) instead of with input as {query}.
• Bumps the version.

@tmcknight Leaving the merge and release for you, unless you prefer I do it.

[tmcknight]

Awesome! Thanks for doing this. I'll get a new release created.