Add links to credits section

Adds hyperlinks to the credits section for Wikipedia, the puzzle book, Peter Winkler, Martin Gardner, and Akash Kumar.

src/components/BulgarianSolitaire.tsx

@@ -432,7 +432,27 @@ const BulgarianSolitaire: React.FC<BulgarianSolitaireProps> = ({ showSocialShare
       <div className="bg-muted/30 rounded-lg p-6 space-y-4">
         <h3 className="text-lg font-semibold">Credits:</h3>
         <p className="text-sm text-muted-foreground">
-          Find out more about Bulgarian Solitaire on Wikipedia. I learned of this game from Akash Kumar, who very kindly walked me through the argument found in Peter Winkler's beautiful puzzle book, available here. The game was introduced by Martin Gardner.
+          Find out more about Bulgarian Solitaire on{" "}
+          <a href="https://en.wikipedia.org/wiki/Bulgarian_solitaire" target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+            Wikipedia
+          </a>
+          . I learned of this game from{" "}
+          <a href="https://sites.google.com/view/kumarakash/home" target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+            Akash Kumar
+          </a>
+          , who very kindly walked me through the argument found in{" "}
+          <a href="https://math.dartmouth.edu/~pw/" target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+            Peter Winkler's
+          </a>
+          {" "}beautiful puzzle book,{" "}
+          <a href="https://math.dartmouth.edu/news-resources/electronic/puzzlebook/book/book.pdf" target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+            available here
+          </a>
+          . The game was introduced by{" "}
+          <a href="https://en.wikipedia.org/wiki/Martin_Gardner" target="_blank" rel="noopener noreferrer" className="text-primary hover:underline">
+            Martin Gardner
+          </a>
+          .
         </p>
       </div>