shorten UUIDs (not sure about this one)

src/config.rs

@@ -60,7 +60,7 @@ pub struct Config {
 fn default_network() -> String {
     // default to testnet
     // TODO: remove instruction from docs to set brain_url, since it defaults now
-    "testnet".to_string()
+    "testing".to_string()
 }
 
 #[derive(thiserror::Error, Debug)]
@@ -355,7 +355,7 @@ impl Config {
     }
 
     pub fn set_network(mut network: &str) {
-        if network != "staging" && network != "testnet" {
+        if network != "staging" {
             log::error!(
                 "The network {network} is not officially supported. Defaulting to testnet!"
             );