add commit to bottom nav

app/__init__.py

@@ -85,10 +85,14 @@ def create_app():
 
     @app.context_processor
     def inject_constants():
+        commit = ""
+        with open('.git/refs/heads/main') as f:
+            commit = f.read().strip()
         return {
             "InfoboxIcons": InfoboxIcons,
             "InfoboxHTMLClass": InfoboxHTMLClass,
             "InfoboxKind": InfoboxKind,
+            "__commit": commit,
         }
 
     @app.context_processor