use sharable link to proposal on home page

Author: Ian Redpath

public/index.html

@@ -48,7 +48,7 @@ <h1 class="page-header">Virtual Movie Library</h1>
 	    	</div>
 	    	<div class="virtual-movie-library-link">
 	    		<a href="./project">Show me!</a>
-	    		<a href="https://docs.google.com/document/d/1rKmGsvVj2et2Ptl6xKtyGkyjs8pgZQZqlyfxXdNs_no">
+	    		<a href="https://docs.google.com/document/d/1rKmGsvVj2et2Ptl6xKtyGkyjs8pgZQZqlyfxXdNs_no/edit?usp=sharing">
 	    			Project Proposal
 	    		</a>
 	    	</div>