embed static files as go strings

plugins/ui/css/bulma-darkly.css

plugins/ui/files.go

plugins/ui/src/builder.js

plugins/ui/src/css/styles.css

plugins/ui/src/favicon.ico

plugins/ui/src/index.html

plugins/ui/src/js/forcegraph.js

plugins/ui/src/js/icons.js

plugins/ui/src/js/initials.js

plugins/ui/src/js/main.js

plugins/ui/src/js/tpschart.js

plugins/ui/src/js/utils.js

plugins/ui/ui.go