docs: update reproduction link (#1304)

* docs: update reproduction link

* update codesandbox reference

* remove redundant a

* code review suggestion

Co-authored-by: Tim Deschryver <28659384+timdeschryver@users.noreply.github.com>

---------

Co-authored-by: Tim Deschryver <28659384+timdeschryver@users.noreply.github.com>

.github/ISSUE_TEMPLATE/Bug_Report.md

@@ -54,8 +54,8 @@ minimal amount of code possible.
 
 Repository template: https://github.com/testing-library/dom-testing-library-template
 
-Or if you can, try to reproduce the issue in a Codesandbox. You can fork the one
-here: https://codesandbox.io/s/5z6x4r7n0p
+Or if you can, try to reproduce the issue in StackBlitz. You can fork the one
+here: https://testing-library.com/new-dtl
 -->
 
 ### Problem description: