docs: add vitepress docs

docs/.vitepress/config.ts

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+import { defineConfig } from 'vitepress';
+
+// refer https://vitepress.dev/reference/site-config for details
+export default defineConfig({
+  lang: 'en-US',
+  title: 'YaBL wiki',
+  description: 'Next-gen digital library',
+
+  themeConfig: {
+    nav: [
+      { text: 'Get started', link: '/get-started' },
+
+      // {
+      //   text: 'Dropdown Menu',
+      //   items: [
+      //     { text: 'Item A', link: '/item-1' },
+      //     { text: 'Item B', link: '/item-2' },
+      //     { text: 'Item C', link: '/item-3' },
+      //   ],
+      // },
+
+      // ...
+    ],
+
+    /*sidebar: [
+      {
+        // text: 'Guide',
+        items: [
+          { text: 'Example', link: '/example' },
+          // ...
+        ],
+      },
+    ],*/
+  },
+});

docs/.vitepress/theme/custom.css

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+:root {
+  --vp-c-brand-1: #fd7c1a;
+  --vp-c-brand-2: #ff913d;
+  --vp-home-hero-name-color: transparent;
+  --vp-home-hero-name-background: -webkit-linear-gradient(
+    120deg,
+    #ff712f 30%,
+    #ffb555
+  );
+  --vp-button-brand-bg: var(--vp-c-brand-1);
+  --vp-button-brand-hover-bg: var(--vp-c-brand-2);
+}

docs/.vitepress/theme/index.js

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+import DefaultTheme from 'vitepress/theme';
+import './custom.css';
+
+export default DefaultTheme;