Add webviz portable instance to FMU documentation page

Documentation page for solutions https://fmu-for-ccs.radix.equinor.com on radix . "main" codespcae is on develop-floriane.
Create a portable webviz instance using the synthetic model and add link to the documentation page such that users can launch it to see what the webviz page using the webviz config file inthe documentation looks like.