Move /e2e -> /e2e-tests

e2e-tests/cypress/tests/fixtures/markdown/markdown_code_block.html

@@ -0,0 +1 @@
+<h3 class="markdown__heading">Code Blocks</h3><div class="post-code post-code--wrap"><div class="post-code__overlay"><span class="post-code__clipboard"><i role="button" class="icon icon-content-copy"></i></span></div><div class="hljs"><code>This text should render in a code block</code></div></div>