Open footer description links in the same window

This is a funny one, because we were accidentally opening them in the
same window without intending to do so since commit 928312e21, since the
`sanitize` method removes the `target` attribute. So the test we're
adding already passed without these changes.

app/components/layout/footer_component.rb

@@ -8,12 +8,10 @@ class Layout::FooterComponent < ApplicationComponent
   private
 
     def open_source_link
-      link_to(t("layouts.footer.open_source"), t("layouts.footer.open_source_url"), target: "_blank",
+      link_to(t("layouts.footer.open_source"), t("layouts.footer.open_source_url"), rel: "nofollow")
-                                                                                    rel: "nofollow")
     end
 
     def repository_link
-      link_to(t("layouts.footer.consul"), t("layouts.footer.consul_url"), target: "_blank",
+      link_to(t("layouts.footer.consul"), t("layouts.footer.consul_url"), rel: "nofollow")
-                                                                          rel: "nofollow")
     end
 end

spec/components/layout/footer_component_spec.rb

@@ -0,0 +1,13 @@
+require "rails_helper"
+
+describe Layout::FooterComponent do
+  describe "description links" do
+    it "generates links that open in the same tab" do
+      render_inline Layout::FooterComponent.new
+
+      page.find(".info") do |info|
+        expect(info).not_to have_css "a[target]"
+      end
+    end
+  end
+end