Move /e2e -> /e2e-tests

e2e-tests/cypress/tests/fixtures/markdown/markdown_lines.md

@@ -0,0 +1,16 @@
+### Lines
+
+Three lines should render with text between them:
+
+Text above line
+
+***
+
+Text between lines
+
+---
+
+Text between lines
+___
+
+Text below line