Bug fixes

- Feature: `RANCHER_ENDPOINT=` to README.
- Feature: Return of the loading spinner.
- Fix: Editing a container with volumes causes infinite recursion in `serialize()`.
- Change: Rename Container `Console` action to `Execute Shell` to disambiguate with actual console.
- Fix: Host-Only network disappears from Network droppdown if Create Container is shown more than once.
- Change: Move requested host ID from request URI to query param.
- Feature: alt+click on delete buttons will bypass the confirmation.
- Change: Move all host/container actions to `{{action-button}}` component.