browser importmap: point "irclog-api" -> "./dist/index.js"

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/importmap

Author: gdamjan

Diff for: playground/index.html

@@ -6,9 +6,16 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0" />
   <title>Playground</title>
   <link rel="icon" type="image/png" href="./favicon.png">
-  <!--script src="https://unpkg.com/[email protected]"></script-->
   <script src="https://www.typescriptlang.org/js/vs.loader.js"></script>
   <script src="./index.js" defer></script>
+  <script type="importmap">
+    {
+      "imports": {
+        "irclog-api": "./dist/index.js"
+      }
+    }
+  </script>
+
   <style>
     body {
       overflow: hidden;