ci: use submodule as theme location

.github/workflows/document.yml

@@ -21,8 +21,6 @@ jobs:
       - name: Build Webpage
         working-directory: ./docs/
         run: |
-            hugo mod init github.com/alex-shpak/hugo-book
-            hugo mod get -u
             hugo --minify
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3

docs/config.toml

@@ -1,13 +1,9 @@
 baseURL      = "https://toruniina.github.io/toml11"
 title        = "toml11"
 languageCode = "en-us"
-
+theme        = "hugo-book"
 disablePathToLower = true
 
-[module]
-[[module.imports]]
-path = 'github.com/alex-shpak/hugo-book'
-
 [languages]
 [languages.en]
 weight = 1