Added support for nav items

layouts/simplecss/templates/layout_main.html

@@ -13,6 +13,13 @@
 <header>
   <h1>{{ .Site.Title }}</h1>
   <p>{{ .Site.Tagline }}</p>
+  {{ if .Site.NavItems }}
+    <nav>
+    {{ range .Site.NavItems }}
+      {{ if .ShowInNav }}<a href="{{ url_abs .Slug }}">{{ .Title }}</a>{{ end }}
+    {{ end }}
+    </nav>
+  {{ end }}
 </header>
 
 <main>

models/pubmodel/sites.go

@@ -6,6 +6,7 @@ import (
 	"iter"
 
 	"lmika.dev/lmika/weiro/models"
+	"lmika.dev/pkg/modash/moslice"
 )
 
 type Site struct {
@@ -20,3 +21,7 @@ type Site struct {
 	CategoriesOfPost   func(ctx context.Context, postID int64) ([]*models.Category, error)
 	Pages              []*models.Page
 }
+
+func (s Site) NavItems() []*models.Page {
+	return moslice.Filter(s.Pages, func(p *models.Page) bool { return p.ShowInNav })
+}