feat: Convert errorCodes using markdown

package.json

@@ -84,6 +84,7 @@
     "@types/bcrypt": "^5.0.0",
     "@types/cors": "^2.8.10",
     "@types/end-of-stream": "^1.4.0",
+    "@types/marked": "^2.0.3",
     "@types/mime-types": "^2.1.0",
     "@types/n3": "^1.10.0",
     "@types/node": "^15.12.5",
@@ -112,6 +113,7 @@
     "fetch-sparql-endpoint": "^2.0.1",
     "handlebars": "^4.7.7",
     "jose": "^3.11.6",
+    "marked": "^2.1.3",
     "mime-types": "^2.1.31",
     "n3": "^1.10.0",
     "nodemailer": "^6.6.2",