Remove alert for Internet Explorer 8 and below

Internet Explorer 8 was released in 2009 and people using it already
know that most web pages look broken on it, so we don't need to warn
them.

Removing it makes our application layout file much easier to read and
modify.

spec/spec_helper.rb

@@ -58,10 +58,6 @@ RSpec.configure do |config|
     Capybara::Webmock.stop
   end
 
-  config.after(:each, :page_driver) do
-    page.driver.reset!
-  end
-
   config.before(:each, type: :system) do |example|
     driven_by :headless_chrome
     Capybara.default_set_options = { clear: :backspace }

spec/system/home_spec.rb

@@ -105,39 +105,6 @@ describe "Home" do
     end
   end
 
-  describe "IE alert", :no_js do
-    scenario "IE visitors are presented with an alert until they close it", :page_driver do
-      # Selenium API does not include page request/response inspection methods
-      # so we must use Capybara::RackTest driver to set the browser's headers
-      Capybara.current_session.driver.header(
-        "User-Agent",
-        "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)"
-      )
-
-      visit root_path
-      expect(page).to have_xpath(ie_alert_box_xpath)
-      expect(page.driver.request.cookies["ie_alert_closed"]).to be nil
-
-      # faking close button, since a normal find and click
-      # will not work as the element is inside a HTML conditional comment
-      page.driver.browser.set_cookie("ie_alert_closed=true")
-
-      visit root_path
-      expect(page).not_to have_xpath(ie_alert_box_xpath)
-      expect(page.driver.request.cookies["ie_alert_closed"]).to eq("true")
-    end
-
-    scenario "non-IE visitors are not bothered with IE alerts", :page_driver do
-      visit root_path
-      expect(page).not_to have_xpath(ie_alert_box_xpath)
-      expect(page.driver.request.cookies["ie_alert_closed"]).to be nil
-    end
-
-    def ie_alert_box_xpath
-      "/html/body/div[@class='wrapper ']/comment()[contains(.,'ie-callout')]"
-    end
-  end
-
   describe "Menu button" do
     scenario "is not present on large screens" do
       visit root_path