feat: compile time completion generation

Removed `completion` command in favor of compile time completion
generation. This tool will only be build from source for the foreseeable
future so this makes sense for now.

src/main.rs

@@ -1,7 +1,7 @@
 use ahab::{cli, scripts};
 
 use anyhow::Result;
-use clap::{CommandFactory, Parser};
+use clap::Parser;
 
 fn main() -> Result<()> {
     // always load dotenv on start
@@ -13,15 +13,6 @@ fn main() -> Result<()> {
     let args = cli::Ahab::parse();
 
     match args.command {
-        cli::Commands::Completion { shell } => {
-            clap_complete::generate(
-                shell,
-                &mut cli::Ahab::command(),
-                "ahab",
-                &mut std::io::stdout(),
-            );
-            Ok(())
-        }
         cli::Commands::Docker { command } => match command {
             cli::Docker::StopAll => scripts::docker::stop_all(),
         },