fix links - it seems that md files cannot be called index.md

docs/index.md

-# Home
-
-### Week 03 - CAM
-- [Group Assignment](assignments/week03/group-project/index.md)
-- [OpenScad](assignments/week03/openscad-adai-edu/index.md)
-
-### Week 04 - Lorem Ipsum

docs/welcome.md

+# Home
+
+### Week 03 - CAM
+- [Group Assignment](assignments/week03/group-project/week03-group-project.md)
+- [OpenScad](assignments/week03/openscad-adai-edu/week03-openscad.md)
+
+### Week 04 - Lorem Ipsum

mkdocs.yml

@@ -12,13 +12,13 @@ theme:
 
 nav:
   - Home:
-    - Welcome: index.md
-    - About us: about\index.md
+    - Welcome: welcome.md
+    - About us: about\about-us.md
   - Assignments:
-      - Week 3 - CAM: assignments/week03/group-project/index.md
-      - Week 4 - ????: assignments/week03/group-project/index.md
+      - Week 3 - CAM: assignments/week03/group-project/week03-group-project.md
+      - Week 4 - ????: assignments/week03/group-project/week04-?????.md
   - Rambling and Deviations:
-    - Week 03 - Adai & Edu explore OpenScad: assignments/week03/openscad-adai-edu/index.md
+    - Week 03 - Adai & Edu explore OpenScad: assignments/week03/openscad-adai-edu/week03-openscad.md
   - Team Tips:
     - Git: tips/git-settings.md