Ensure properly configured BaseUrl.

src/config/config.go.example

@@ -1,7 +1,9 @@
 package config
 
 var Config = HMNConfig{
-	Env: Dev,
+	Env:     Dev,
+	Addr:    ":9001",
+	BaseUrl: "http://handmade.local:9001",
 	Postgres: PostgresConfig{
 		User:     "hmn",
 		Password: "password",

src/hmnurl/hmnurl.go

@@ -22,6 +22,9 @@ func init() {
 	if err != nil {
 		panic(oops.New(err, "could not parse base URL"))
 	}
+	if parsed.Scheme == "" || parsed.Host == "" {
+		panic(oops.New(nil, "Website is misconfigured. Config should include a full BaseUrl (e.g. \"http://handmade.local:9001\")"))
+	}
 
 	baseUrlParsed = *parsed
 }