Reorganize source files

src/index.html

@@ -212,6 +212,6 @@
                 </div>
             </div>
         </div>
-        <script type="module" src="index.ts"></script>
+        <script type="module" src="ts/index.ts"></script>
     </body>
 </html>

src/ts/index.ts

@@ -1,5 +1,5 @@
 import * as bootstrap from 'bootstrap';
-import xslContent from 'bundle-text:./MessageLog.xsl';
+import xslContent from 'bundle-text:../xsl/MessageLog.xsl';
 import * as ui from './ui';
 import { db } from './db';