Reorganize Markdown page

mkdocs.yml

@@ -191,7 +191,7 @@ pages:
 - Documentation:
   - Writing Documentation: documentation.md     # page-tree = NEED_PAGE_MOVE to /documentation/writing.md
   - Documenting Extensions: documentation/extensions.md
-  - Markdown: markdownrules.md                  # page-tree = NEED_PAGE_MOVE to /documentation/markdown.md
+  - Markdown: documentation/markdown.md
   - Style Guide: best-practices/documentation-style-guide.md  # page-tree = NEED_PAGE_MOVE to /documentation/style-guide.md
 - Content to reorganize:
   - Extensions files: extensions/files.md

redirects/internal.txt

 dev-tools/debugging basics/debugging
-extend-stages extensions/lifecycle
\ No newline at end of file
+extend-stages extensions/lifecycle
+markdownrules documentation/markdown
\ No newline at end of file