Rename gooni to probe-cli

This is the command I used:
```
rg 'github.com/openobservatory/gooni' --files-with-matches \
    | xargs sed -i '' 's/github.com\/openobservatory\/gooni/github.com\/ooni\/probe-cli/g'
```

internal/cli/info/info.go

@@ -3,7 +3,7 @@ package info
 import (
 	"github.com/alecthomas/kingpin"
 	"github.com/apex/log"
-	"github.com/openobservatory/gooni/internal/cli/root"
+	"github.com/ooni/probe-cli/internal/cli/root"
 )
 
 func init() {