Convert "static page" controller specs to system specs (#31599)

spec/system/home_spec.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+describe 'Home page' do
+  context 'when signed in' do
+    before { sign_in Fabricate(:user) }
+
+    it 'visits the homepage and renders the web app' do
+      visit root_path
+
+      expect(page)
+        .to have_css('noscript', text: /Mastodon/)
+    end
+  end
+
+  context 'when not signed in' do
+    it 'visits the homepage and renders the web app' do
+      visit root_path
+
+      expect(page)
+        .to have_css('noscript', text: /Mastodon/)
+    end
+  end
+end