[FEATURE] Enable Markdown rendering

Markdown rendering still has a lot of flaws that are adressed in phpDocumentor/guides#640

Some errors are fixed there (like the warnings going to the log instead of the console and output of simple paragraphs)

For others I added skiped tests

Author: linawolf

composer.json

@@ -5,6 +5,7 @@
         "php": "^8.1",
         "phpdocumentor/guides-cli": "dev-main",
         "phpdocumentor/guides-graphs": "dev-main",
+        "phpdocumentor/guides-markdown": "dev-main",
         "phpdocumentor/guides-theme-bootstrap": "dev-main",
         "symfony/finder": "^6.3",
         "symfony/http-client": "^6.3"