update app.py GUI (order of operations & info/text)

video_semantic_search/app.py

@@ -108,11 +108,11 @@ def display_search_results(results: list[SearchResult]) -> None:
 
 def main():
     st.set_page_config(page_title="video-semantic-search", layout="wide")
-    st.header("Visual content search over videos")
+    st.header("Visual content search over music videos")
     st.markdown("_App by Ben Tenmann and Sidney Radcliffe_")
-    st.text_input("What are you looking for?", key="query")
-    query = st.session_state["query"]
     searcher = get_semantic_searcher()
+    st.text_input(f"What are you looking for? Search over {len(searcher.metadata)} music videos.", key="query")
+    query = st.session_state["query"]
     if query:
         st.text("Click image to open video")
         display_search_results(searcher.search(query))