docs(theming): add theming reference to tutorialkit.dev (#97)

Author: SamVerschueren

docs/tutorialkit.dev/astro.config.ts

@@ -19,7 +19,11 @@ export default defineConfig({
         light: './src/assets/brand/tutorialkit-logo-light.svg',
         replacesTitle: true,
       },
-      plugins: [starlightLinksValidator()],
+      plugins: [
+        starlightLinksValidator({
+          exclude: ['../../guides/**/*'],
+        }),
+      ],
       sidebar: [
         {
           label: 'Guides',
@@ -51,6 +55,15 @@ export default defineConfig({
             },
           ],
         },
+        {
+          label: 'Reference',
+          items: [
+            {
+              label: 'Theming',
+              link: '/reference/theming/',
+            },
+          ],
+        },
       ],
       tableOfContents: {
         maxHeadingLevel: 5,