https://github.com/shurcooL/vfsgen
https://github.com/shurcooL/httpfs/html

go generate --tags=dev
-> go run assets_gen.go assets.go

go build --tags=dev -o ./tmp/dev .
    main.go
    assets.go
    + static/
    + templates/

go build -o ./tmp/release .
    main.go
    assets_vfsdata.go

