wiki_service fix, HowtosIndexPage fix

apps/api/app/services/wiki_service.rb

@@ -3,7 +3,7 @@ require "json"
 
 # Fetches wiki pages (blog, howto, …) from the Grav backend, filtered by tag.
 #
-# Grav exposes:  GET {WIKI_GRAV_URL}/api/pages.json?tag=<tag>[&limit=<n>][&body=1]
+# Grav exposes:  GET {WIKI_GRAV_URL}/custom/pages.json?tag=<tag>[&limit=<n>][&body=1]
 # and returns:
 #   {
 #     "tag": "howto", "count": 24,
@@ -26,7 +26,7 @@ class WikiService
     query[:limit] = limit if limit.present?
     query[:body]  = body  if body.present?
 
-    uri = URI.parse("#{GRAV_URL}/api/pages.json")
+    uri = URI.parse("#{GRAV_URL}/custom/pages.json")
     uri.query = URI.encode_www_form(query)
 
     response = Net::HTTP.start(