feat: rebuild site content management

Replace legacy FAQ, downloads, and release flows with project and blog publishing. Add configurable branding and theme fields plus clean-start Compose seeding support.

apps/core/admin.py

@@ -1,3 +1,4 @@
+from django import forms
 from django.contrib import admin
 from django.http import HttpResponseRedirect
 from django.urls import reverse
@@ -5,9 +6,36 @@ from django.urls import reverse
 from .models import SiteBranding, SiteContact
 
 
+class SiteBrandingForm(forms.ModelForm):
+    class Meta:
+        model = SiteBranding
+        fields = "__all__"
+        widgets = {
+            field: forms.TextInput(attrs={"type": "color"})
+            for field in (
+                "border_color",
+                "background_color",
+                "surface_color",
+                "primary_color",
+                "secondary_color",
+                "accent_color",
+                "text_color",
+                "muted_text_color",
+            )
+        }
+
+
 @admin.register(SiteBranding)
 class SiteBrandingAdmin(admin.ModelAdmin):
+    form = SiteBrandingForm
     fieldsets = (
+        (
+            "Site identity",
+            {
+                "fields": ("site_name", "short_name", "tagline", "meta_description"),
+                "description": "Names and text used throughout the public website.",
+            },
+        ),
         (
             "Brand assets",
             {
@@ -44,6 +72,21 @@ class SiteBrandingAdmin(admin.ModelAdmin):
                 ),
             },
         ),
+        (
+            "Site colours",
+            {
+                "fields": (
+                    "background_color",
+                    "surface_color",
+                    "primary_color",
+                    "secondary_color",
+                    "accent_color",
+                    "text_color",
+                    "muted_text_color",
+                ),
+                "description": "Use six-digit hex colours. Changes apply across the public site.",
+            },
+        ),
     )
 
     def has_add_permission(self, request):