Change Content and Index to create pretty urls

omicron/ssg/output/content.py

@@ -42,7 +42,7 @@ class Content(Output):
     def build_path(section: str, slug: str) -> Path:
         if not Content._SECTION_RE.match(section):
             raise ContentError(f"Invalid section '{section}'")
-        path = Path(f"{section}/{slug}.html")
+        path = Path(f"{section}/{slug}/index.html")
         return path
 
     def read_body(self) -> str:

omicron/ssg/output/index.py

@@ -44,7 +44,7 @@ class Index(Output):
         if page_num == 1:
             file = Path("index.html")
         else:
-            file = Path(f"page-{page_num}.html")
+            file = Path(f"page-{page_num}/index.html")
 
         if kind == "root":
             path = file