updated marked to v5; better baseurl handling

package.json

@@ -17,7 +17,7 @@
     "@types/jsdom": "^20.0.0",
     "@types/katex": "^0.16.0",
     "@types/luxon": "^3.1.0",
-    "@types/marked": "^4.0.3",
+    "@types/marked": "^5.0.0",
     "@types/node": "^18.11.18",
     "@types/prismjs": "^1.26.0",
     "@types/qrcode": "^1.5.0",
@@ -28,7 +28,7 @@
     "dompurify": "^2.3.6",
     "jsdom": "^20.0.1",
     "katex": "^0.16.7",
-    "marked": "^4.1.1",
+    "marked": "^5.0.2",
     "nomnoml": "^1.5.2",
     "pikchr": "^0.0.5",
     "prismjs": "^1.29.0",