wip: restructure the entire CLI

src/cli/build/mod.rs

@@ -0,0 +1,12 @@
+use crate::cfg::ConfigOptsBuild;
+use anyhow::Result;
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+/// Build the Rust WASM app and all of its assets.
+#[derive(Clone, Debug, StructOpt)]
+#[structopt(name = "build")]
+pub struct Build {
+    #[structopt(flatten)]
+    pub build: ConfigOptsBuild,
+}