Add page for project proposals in navigation

Added a new page for project proposals to the navigation.

Author: aak2257

main_page.py

@@ -3,9 +3,10 @@
 # Define the pages
 main_page = st.Page("app.py", title="EIA Fuel Type Demand")
 page_2 = st.Page("region.py", title="EIA Region Demand")
-
+page_3 = st.Page("proposal.py", title="Project Proposal, Feedback, and Reflections")
 # Set up navigation
 pg = st.navigation([main_page, page_2])
 
 # Run the selected page
 pg.run()
+