Move commands to own module

brood/src/main.rs

@@ -1,5 +1,5 @@
+pub mod commands;
 mod data;
-mod ingest;
 mod util;
 
 use std::io;
@@ -9,7 +9,7 @@ use clap::Parser;
 
 #[derive(Debug, Parser)]
 enum Command {
-    /// Read sift data on stdin and output brood data on stdout.
+    /// Read sift data on stdin and output brood data.
     Ingest,
 }
 
@@ -23,6 +23,6 @@ struct Args {
 fn main() -> io::Result<()> {
     let args = Args::parse();
     match args.command {
-        Command::Ingest => ingest::ingest(&args.datafile),
+        Command::Ingest => commands::ingest(&args.datafile),
     }
 }