Add first page and links

app.py

@@ -167,6 +167,11 @@ if "images" not in st.session_state:
         ]
 
 st.title("Image Subject Comparison Tutorial")
+st.markdown(
+    "This is a small tutorial for Depictor. It is meant to provide examples for how to make "
+    "the decisions for the questions asked."
+)
+st.markdown("---")
 st.markdown(
     "This tutorial demonstrates rules for determining if two images depict the same subject. "
     "Answer each scenario to advance to the next one."
@@ -195,11 +200,13 @@ else:
             st.image(img1, caption="Image 1", use_container_width=True)
         else:
             st.error("Image 1 could not be loaded.")
+        st.markdown(f"[🔗 View source]({scenario['image1_url']})")
     with col2:
         if img2:
             st.image(img2, caption="Image 2", use_container_width=True)
         else:
             st.error("Image 2 could not be loaded.")
+        st.markdown(f"[🔗 View source]({scenario['image2_url']})")
 
     st.markdown("### Are these the same subject?")