build failures

THis is a very nice demo of what can be done with golang and flutter together.

Not sure if this is stable yet but on MAIN branch things are broken.

Might be worth making a makefile in root.

````
go mod init
go: creating new go.mod: module github.com/google/note-maps

cd note-maps
➜ note-maps git:(main) ✗ go run .
go: finding module for package github.com/google/subcommands
go: finding module for package github.com/google/note-maps/notes/notespb
go: finding module for package gopkg.in/yaml.v3
go: downloading gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
go: found github.com/google/subcommands in github.com/google/subcommands v1.2.0
go: found gopkg.in/yaml.v3 in gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776
go: finding module for package github.com/google/note-maps/notes/notespb
config.go:25:2: no matching versions for query "latest"

````