add validation before to create branch
diff --git a/Gemfile b/Gemfile
index 9fe6d9f..5face85 100644
--- a/Gemfile
+++ b/Gemfile
@@ -13,4 +13,4 @@
   gem 'jekyll-asciidoc', '~> 2.1.1'
 end
 
-# gem "html-proofer"
+gem "html-proofer"
diff --git a/Gemfile.lock b/Gemfile.lock
index 56d679e..1c0b1f0 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,9 +10,19 @@
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
+    ethon (0.12.0)
+      ffi (>= 1.3.0)
     eventmachine (1.2.7)
     ffi (1.14.2)
     forwardable-extended (2.6.0)
+    html-proofer (3.18.6)
+      addressable (~> 2.3)
+      mercenary (~> 0.3)
+      nokogumbo (~> 2.0)
+      parallel (~> 1.3)
+      rainbow (~> 3.0)
+      typhoeus (~> 1.3)
+      yell (~> 2.0)
     http_parser.rb (0.6.0)
     i18n (1.8.9)
       concurrent-ruby (~> 1.0)
@@ -47,9 +57,18 @@
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
+    nokogiri (1.11.1-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.11.1-x86_64-darwin)
+      racc (~> 1.4)
+    nokogumbo (2.0.4)
+      nokogiri (~> 1.8, >= 1.8.4)
+    parallel (1.20.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
+    racc (1.5.2)
+    rainbow (3.0.0)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
@@ -60,13 +79,17 @@
       ffi (~> 1.9)
     terminal-table (2.0.0)
       unicode-display_width (~> 1.1, >= 1.1.1)
+    typhoeus (1.4.0)
+      ethon (>= 0.9.0)
     unicode-display_width (1.7.0)
+    yell (2.2.2)
 
 PLATFORMS
   universal-darwin-20
 
 DEPENDENCIES
   coderay (~> 1.1.0)
+  html-proofer
   jekyll (~> 4.2)
   jekyll-asciidoc (~> 2.1.1)
 
diff --git a/script/cibuild b/script/cibuild
index 9e73ad0..a9ae4f4 100644
--- a/script/cibuild
+++ b/script/cibuild
@@ -11,12 +11,15 @@
 mv _config.yml.tmp _config.yml
 
 bundle exec jekyll build
-#bundle exec htmlproofer ./_site
+bundle exec htmlproofer ./_site
 mkdir -p ../tmp
 mv ./_site/* ../tmp
 
 git checkout --orphan ${BRANCH_PAGE}
 rm -rf ./*
+rm .asf.yaml
+rm .gitignore
+rm .travis*
 
 mv ../tmp/* ./