add image support to letter card on board page

Author: Ciphrox

src/assets/styles/alphabets/[alphabet]/board.css

@@ -2,9 +2,11 @@
   display: flex;
   flex-direction: column;
   width: 100%;
+  height: calc(100vh - 4rem);
+  overflow-y: scroll;
   gap: 1rem;
   align-items: flex-start;
-  justify-content: center;
+  justify-content: flex-start;
   padding: 1rem;
 
   & .back {