Fix extra Git output in rojo init and update place template

assets/default-place-project/README.md

@@ -5,10 +5,10 @@ Generated by [Rojo](https://github.com/rojo-rbx/rojo) {rojo_version}.
 To build the place from scratch, use:
 
 ```bash
-rojo build -o Place.rbxlx
+rojo build -o "{project_name}.rbxlx"
 ```
 
-Next, open `Place.rbxlx` in Roblox Studio and start the Rojo server:
+Next, open `{project_name}.rbxlx` in Roblox Studio and start the Rojo server:
 
 ```bash
 rojo serve

src/cli/init.rs

@@ -171,6 +171,7 @@ fn should_git_init(path: &Path) -> bool {
     let result = Command::new("git")
         .args(&["rev-parse", "--is-inside-work-tree"])
         .stdout(Stdio::null())
+        .stderr(Stdio::null())
         .current_dir(path)
         .status();