Sync notifications and troubleshooting guides (#998)

* Add help articles

* Broadcast sync messages as notifications

* Lint fixes

* more lint fixes

* Remove redundant code

test/controllers/help/articles_controller_test.rb

@@ -0,0 +1,18 @@
+require "test_helper"
+
+class Help::ArticlesControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in @user = users(:family_admin)
+
+    @article = Help::Article.new(frontmatter: { title: "Test Article", slug: "test-article" }, content: "")
+
+    Help::Article.stubs(:find).returns(@article)
+  end
+
+  test "can view help article" do
+    get help_article_path(@article)
+
+    assert_response :success
+    assert_dom "h1", text: @article.title, count: 1
+  end
+end