Add --include-dependencies to 'aiken docs'

Fixes #867.

crates/aiken/src/cmd/docs.rs

@@ -15,6 +15,10 @@ pub struct Args {
     #[clap(short, long)]
     watch: bool,
 
+    /// When enabled, also generate documentation from dependencies.
+    #[clap(long)]
+    include_dependencies: bool,
+
     /// Output directory for the documentation
     #[clap(short = 'o', long)]
     destination: Option<PathBuf>,
@@ -26,14 +30,17 @@ pub fn exec(
         deny,
         watch,
         destination,
+        include_dependencies,
     }: Args,
 ) -> miette::Result<()> {
     let result = if watch {
         watch_project(directory.as_deref(), watch::default_filter, 500, |p| {
-            p.docs(destination.clone())
+            p.docs(destination.clone(), include_dependencies)
         })
     } else {
-        with_project(directory.as_deref(), deny, |p| p.docs(destination.clone()))
+        with_project(directory.as_deref(), deny, |p| {
+            p.docs(destination.clone(), include_dependencies)
+        })
     };
 
     result.map_err(|_| process::exit(1))