Feature Request: Per-link offset

[Undistraction]

It would be great to be able to specify an offset for specific links to override the global offset. This could be provided in the form of a query string that is parsed out by the plugin when introspecting for the hash:

https://example.com/?offset=30#some-component-id

[shelleyphant]

Or an offset based on screen width for mobile sites that have a fixed navigation bar at the top