remove treehouse-format crate and collapse everything into src

src/dirs.rs

@@ -0,0 +1,15 @@
+use crate::vfs::DynDir;
+
+#[derive(Debug, Clone)]
+pub struct Dirs {
+    pub root: DynDir,
+
+    pub content: DynDir,
+    pub static_: DynDir,
+    pub template: DynDir,
+
+    // `static` directories
+    pub pic: DynDir,
+    pub emoji: DynDir,
+    pub syntax: DynDir,
+}