feat: implement back button for banner

This button is intended to bring the user all the way back to the specified dashboard. Another could be created to exit the form, but I don't think that's needed for now.

src/pages/provider_contact.rs

@@ -148,7 +148,7 @@ pub fn ProviderContactPage() -> impl IntoView {
 
 // Display contact form.
     view! {
-        <Banner title="R15 Scholarships" logo="/PHS_Stacked_Acronym.png" path="/" />
+        <Banner title="R15 Scholarships" logo="/PHS_Stacked_Acronym.png" path="/providers" />
         <AuthLoaded fallback=Loading>
             <Authenticated unauthenticated=UnauthenticatedPage>
                 <Suspense fallback=Loading>