api: Move PDF Generation assets

src/api/src/create_book/generators/pdf/book.html

@@ -30,7 +30,7 @@
         
         <p id="copyright-printing">Printing: {printing}</p>
 
-        <p id="copyright-printing">ID: {book_id}. <a href="https://wattpad.com/story/{book_id}" target="_blank" id="copyright-link">View this Book Online</a></p>
+        <p id="book-link">ID: {book_id}. <a href="https://wattpad.com/story/{book_id}" target="_blank" id="copyright-link">View this Book Online</a></p>
         
         
 

src/api/src/create_book/generators/pdf/stylesheet.css

@@ -389,6 +389,14 @@ a:hover {
 
 }
 
+#book-link {
+  font-size: 14px;
+  color: #666;
+  margin: 8px 0;
+  text-align: center;
+
+}
+
 #copyright-separator {
   width: 100%;
   max-width: 400px;