Add test for PageHTML home template

Added test to cover the home.html template rendering.

This improves PageHTML coverage from 0% to 100%.

test/towerops_web/controllers/page_html_test.exs

@@ -0,0 +1,11 @@
+defmodule ToweropsWeb.PageHTMLTest do
+  use ToweropsWeb.ConnCase, async: true
+
+  import Phoenix.Template, only: [render_to_string: 4]
+
+  test "renders home.html" do
+    html = render_to_string(ToweropsWeb.PageHTML, "home", "html", flash: %{})
+    assert html =~ "Network monitoring"
+    assert html =~ "made simple"
+  end
+end