Remove githubId

Enable hook for ebook

theme/javascript/core/state.js

@@ -7,7 +7,6 @@ define([
         var $book = $(dom.find(".book"));
 
         state.$book = $book;
-        state.githubId = $book.data("github");
         state.level = $book.data("level");
         state.basePath = $book.data("basepath");
         state.revision = $book.data("revision");

theme/javascript/gitbook.js

@@ -18,11 +18,6 @@ define([
         var $book;
         $book = state.$book;
 
-        if (state.githubId) {
-            // Initialize storage
-            storage.setBaseKey(state.githubId);
-        }
-
         // Init sidebar
         sidebar.init();