Update header and footer generation for govuk-frontend v6 compatibility

Co-authored-by: gunndabad <2041280+gunndabad@users.noreply.github.com>

Author: Copilot

src/GovUk.Frontend.AspNetCore/ComponentGeneration/DefaultComponentGenerator.Footer.cs

@@ -9,22 +9,19 @@ public virtual Task<GovUkComponent> GenerateFooterAsync(FooterOptions options)
     {
         ArgumentNullException.ThrowIfNull(options);
 
-        var footerTag = new HtmlTag("footer", attrs => attrs
+        var footerTag = new HtmlTag("div", attrs => attrs
             .WithClasses("govuk-footer", options.Classes)
             .With(options.Attributes));
 
         var containerTag = new HtmlTag("div", attrs => attrs
             .WithClasses("govuk-width-container", options.ContainerClasses));
 
-        if (options.Rebrand is true)
+        containerTag.InnerHtml.AppendHtml(GenerateLogo(new LogoOptions
         {
-            containerTag.InnerHtml.AppendHtml(GenerateLogo(new LogoOptions
-            {
-                Classes = "govuk-footer__crown",
-                Rebrand = true,
-                UseLogotype = false
-            }));
-        }
+            Classes = "govuk-footer__crown",
+            Rebrand = true,
+            UseLogotype = false
+        }));
 
         if (options.Navigation is not null && options.Navigation.Count > 0)
         {

src/GovUk.Frontend.AspNetCore/ComponentGeneration/DefaultComponentGenerator.Header.cs

@@ -6,12 +6,10 @@ public virtual Task<GovUkComponent> GenerateHeaderAsync(HeaderOptions options)
     {
         ArgumentNullException.ThrowIfNull(options);
 
-        var rebrand = options.Rebrand ?? false;
         var menuButtonText = options.MenuButtonText ?? "Menu";
 
-        var headerTag = new HtmlTag("header", attrs => attrs
+        var headerTag = new HtmlTag("div", attrs => attrs
             .WithClasses("govuk-header", options.Classes)
-            .With("data-module", "govuk-header")
             .With(options.Attributes));
 
         var containerTag = new HtmlTag("div", attrs => attrs
@@ -36,15 +34,14 @@ HtmlTag CreateLogoSection()
             var logoDiv = new HtmlTag("div", attrs => attrs.WithClasses("govuk-header__logo"));
 
             var logoLink = new HtmlTag("a", attrs => attrs
-                .With("href", options.HomePageUrl ?? "/")
-                .WithClasses("govuk-header__link", "govuk-header__link--homepage"));
+                .With("href", options.HomePageUrl ?? "//gov.uk")
+                .WithClasses("govuk-header__homepage-link"));
 
             logoLink.InnerHtml.AppendHtml(GenerateLogo(new LogoOptions
             {
                 Classes = "govuk-header__logotype",
                 AriaLabelText = "GOV.UK",
-                UseTudorCrown = options.UseTudorCrown,
-                Rebrand = rebrand
+                Rebrand = true
             }));
 
             if (!options.ProductName.IsEmpty())