add function to convert filename to title

src/zona/util.py

@@ -1,5 +1,6 @@
 from pathlib import Path
 from shutil import copy2
+import string
 
 
 def ensure_parents(target: Path):
@@ -11,3 +12,9 @@ def copy_static_file(src: Path, dst: Path):
     """Copy a static file from one location to another."""
     ensure_parents(dst)
     copy2(src, dst)
+
+
+def filename_to_title(path: Path) -> str:
+    name = path.stem
+    words = name.replace("-", " ").replace("_", " ")
+    return string.capwords(words)