This is an example of how to use the plugin API in Websak pluss.
To test the example, run npm run build and host the dist folder on a web
server with https. Add the url to the bootstrap.js file in the plugins array of
the Websak+ app settings, navigate to Websak+ and edit a document. On the
context menu of the search for contact field, you should now see a choice named
Søk i 3. parts tjeneste which will open search.html as an iframe.
Note that the bootstrap script should be loaded with a query string parameter
endpoint with URL to the iframe which should be loaded when the user selects
the external search dialog.