fix: add parameters on sample and var for logo

config.sample.json

@@ -1,6 +1,9 @@
 {
   "xmpp": "https://jabber.happy-dev.fr/http-bind/",
   "authority": "http://localhost:8000/",
+  "clientLogo": "/images/logo.png",
+  "authorityName": "djangoldp-server-name",
+  "clientName": "Sib App",
   "endpoints": {
     "businessproviders": "http://localhost:8000/businessproviders/",
     "circles": "http://localhost:8000/circles/",

src/header.pug

@@ -1,6 +1,6 @@
 #logo
   sib-link(next='members')
-    img(src='/images/logo.png' width=111 height=32)
+    img(src=`${clientLogo || '/images/logo.png'}` width=111 height=32)
 
 //- #search-bar
 //-   input#search-input(type='search')