tidy up the DatabaseStep and add in full form validation support along with the ability to use the setup api to validate the connection details of possible new database creation.

new setup process working end-to-end in React now.  still more to do, but all the pieces are in place now.

get the initial portion of the setup process running on the fronted.  we can now use the generated setup url w/ setup token to create the initial user account and then continue on with the rest of the setup process.

move /frontend_client -> /resources/frontend_client to make sure the static resources are bundled in our jar files.
small updates to main routes.clj file to make static asset serving from "resources" instead of "files", which allows for serving out of jars.