feat: git command output is suppressed

Closes kemitix/git-next#27

src/server/actors/repo/branch.rs

@@ -217,6 +217,8 @@ pub fn reset(
     info!("Running command: {}", command);
     match gix::command::prepare(command)
         .with_shell_allow_argument_splitting()
+        .stdout(std::process::Stdio::null())
+        .stderr(std::process::Stdio::null())
         .spawn()
     {
         Ok(mut child) => match child.wait() {