fix: configure Vercel build for Hugo with official hugo-book theme

- Add vercel.json with Hugo 0.146.0 and git submodules enabled
- Switch to official hugo-book theme repo (alex-shpak/hugo-book)
- Update deprecated Hugo functions for v0.146.0 compatibility

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: pseudoyu

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "themes/hugo-book"]
 	path = themes/hugo-book
-	url = https://github.com/pseudoyu/hugo-book
+	url = https://github.com/alex-shpak/hugo-book

README.md

@@ -41,8 +41,8 @@ The articles in 《区块链入门指南》 are licensed under a [Creative Commo
         </a>
     </td>
     <td align="center">
-        <a href="https://github.com/deemoxuchao">
-            <img src="https://avatars.githubusercontent.com/u/13073679?v=4" width="100;" alt="deemoxuchao"/>
+        <a href="https://github.com/HsuQ">
+            <img src="https://avatars.githubusercontent.com/u/13073679?v=4" width="100;" alt="HsuQ"/>
             <br />
             <sub><b>Hsurich</b></sub>
         </a>

layouts/partials/docs/brand.html

@@ -1,5 +1,5 @@
 <h2 class="book-brand">
-  <a class="flex align-center" href="{{ cond (not .Site.Home.File) .Sites.First.Home.RelPermalink .Site.Home.RelPermalink }}">
+  <a class="flex align-center" href="{{ cond (not .Site.Home.File) .Sites.Default.Home.RelPermalink .Site.Home.RelPermalink }}">
     {{- with .Site.Params.BookLogo -}}
     <img src="{{ . | relURL }}" alt="Logo" />
     {{- end -}}

layouts/partials/docs/html-head.html

@@ -21,7 +21,7 @@
 {{- end -}}
 
 <!-- Theme stylesheet, you can customize scss by creating `assets/custom.scss` in your website -->
-{{- $styles := resources.Get "book.scss" | resources.ExecuteAsTemplate "book.scss" . | resources.ToCSS | resources.Minify | resources.Fingerprint }}
+{{- $styles := resources.Get "book.scss" | resources.ExecuteAsTemplate "book.scss" . | css.Sass | resources.Minify | resources.Fingerprint }}
 <link rel="stylesheet" href="{{ $styles.RelPermalink }}" {{ template "integrity" $styles }}>
 
 {{- if default true .Site.Params.BookSearch -}}

layouts/partials/docs/menu.html

@@ -1,7 +1,7 @@
 <nav>
 {{ partial "docs/brand" . }}
 {{ partial "docs/search" . }}
-{{ if .Site.IsMultiLingual }}
+{{ if hugo.IsMultilingual }}
   {{ partial "docs/languages" . }}
 {{ end }}
 

themes/hugo-book

@@ -0,0 +1,11 @@
+{
+  "git": {
+    "submodules": true
+  },
+  "build": {
+    "env": {
+      "HUGO_VERSION": "0.146.0"
+    }
+  },
+  "buildCommand": "git submodule update --init --recursive && hugo --gc"
+}