* ui: Various CSS amends
1. Split out %icon-definition from %composite-row
2. Add hover effect to node listing
3. Fix up proxy level list components
4. Rename our various pills to use a 100-900 scale
5. Reogranize other icon related things (consul-kind and
consul-external-source)
* Fix up upstream test
* Return all services except Proxies
* Add Gateway icon to the codebase
* Create and implement ConsulExternalSource component
* Fix tests to work with new mock data and add a Gateway test
* Update consul-api-double to 2.14.3
* Create ConsulServiceInstanceList with styling and test
* Implement ConsulServiceInstanceList to Service Detail page
* Implement ConsulExternalSource to Services Show page header
* Update services/show page object
* Update the styling of CompositeRow
* Refactor ConsulServiceList component and styling
* Update ConsulExternalSource to say 'Registered via...'
* Upgrade consul-api-double to patch 2.14.1
* Fix up tests to not use Kind in service models
* Update ListCollection with clickFirstAnchor action
* Add $typo-size-450 to typography base variables
* Create ConsulExternalSource with test and styling
* Implement ConsulExternalSource to Service list page
* Update icons for redesign
* Refactor ListCollection and CompositeRow styling
John Cowen