fix: context issue with account

src/context.pug

@@ -5,6 +5,5 @@ script(data-default-context, type="application/ld+json")
   |     "object": "http://happy-dev.fr/owl/#object",
   |     "author": "http://happy-dev.fr/owl/#author",
   |     "account": "http://happy-dev.fr/owl/#account",
-  |     "jabberID": "foaf:jabberID",
-  |     "picture": "foaf:depiction"
+  |     "jabberID": "foaf:jabberID"
   | }
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