Restructure import test files

apps/client/src/app/pages/portfolio/activities/import-activities-dialog/import-activities-dialog.html

@@ -90,13 +90,13 @@
                   >The following file formats are supported:</span
                 >
                 <a
-                  href="https://github.com/ghostfolio/ghostfolio/blob/main/test/import/ok.csv"
+                  href="https://github.com/ghostfolio/ghostfolio/blob/main/test/import/ok/sample.csv"
                   target="_blank"
                   >CSV</a
                 >
                 <span class="mx-1" i18n>or</span>
                 <a
-                  href="https://github.com/ghostfolio/ghostfolio/blob/main/test/import/ok.json"
+                  href="https://github.com/ghostfolio/ghostfolio/blob/main/test/import/ok/sample.json"
                   target="_blank"
                   >JSON</a
                 >