replace anyhow and log with color_eyre and tracing

Since Himalaya is intended to be ran as a CLI in the terminal emulator
environment, their user experience could vastly improve with better and
more colorful error messages and logging.

This change will replace more minimal libraries for error-reporting/han-
dling with their more advanced counterparts.

Since these crates have tight integrations, this commit will change both
in one shot.

Also we have don't need env_logger any more. So I also have removed that
guy as well.

Signed-off-by: Perma Alesheikh <me@prma.dev>

src/completion/command.rs

@@ -1,8 +1,8 @@
-use anyhow::Result;
 use clap::{value_parser, CommandFactory, Parser};
 use clap_complete::Shell;
-use log::info;
+use color_eyre::Result;
 use std::io;
+use tracing::info;
 
 use crate::cli::Cli;