engine: update docs links to point to tutorial (#1099)

internal/store/engine_state.go

@@ -18,7 +18,7 @@ import (
 	v1 "k8s.io/api/core/v1"
 )
 
-const emptyTiltfileMsg = "Looks like you don't have any docker builds or services defined in your Tiltfile! Check out https://docs.tilt.build/ to get started."
+const emptyTiltfileMsg = "Looks like you don't have any docker builds or services defined in your Tiltfile! Check out https://docs.tilt.build/tutorial.html to get started."
 
 type EngineState struct {
 	// saved so that we can render in order

internal/tiltfile/tiltfile.go

@@ -32,7 +32,7 @@ func Load(ctx context.Context, filename string, matching map[string]bool, logs i
 	absFilename, err := ospath.RealAbs(filename)
 	if err != nil {
 		if os.IsNotExist(err) {
-			return nil, model.Manifest{}, []string{filename}, fmt.Errorf("No Tiltfile found at path '%s'. Check out https://docs.tilt.build/write_your_tiltfile.html", filename)
+			return nil, model.Manifest{}, []string{filename}, fmt.Errorf("No Tiltfile found at path '%s'. Check out https://docs.tilt.build/tutorial.html", filename)
 		}
 		absFilename, _ = filepath.Abs(filename)
 		return nil, model.Manifest{}, []string{absFilename}, err