docs: add initial documentation (#842)

docs/app.config.ts

@@ -0,0 +1,32 @@
+export default defineAppConfig({
+  docus: {
+    title: 'Elk',
+    description: 'A nimble Mastodon web client.',
+    image: 'https://docs.elk.zone/elk-screenshot.png',
+    socials: {
+      twitter: 'elk-zone',
+      github: 'elk-zone/elk',
+    },
+    aside: {
+      level: 0,
+      exclude: [],
+    },
+    header: {
+      logo: true,
+      showLinkIcon: true,
+      exclude: [],
+    },
+    footer: {
+      iconLinks: [
+        {
+          href: 'https://nuxt.com',
+          icon: 'IconNuxtLabs',
+        },
+        {
+          href: 'https://m.webtoo.ls/@elk',
+          icon: 'IconMastodon',
+        },
+      ],
+    },
+  },
+})