Changed "bundle install" to "gem install bundler"

.gitlab-ci.yml

@@ -5,9 +5,8 @@ stages:
 
 before_script:
   - apt-get update -qq && apt-get install -y -qq libcurl4-openssl-dev lftp
-  - bundle install
+  - gem install bundler
   - gem install jekyll
-  - gem install jekyll-theme-minima
 
 deploy_script:
   stage: deploy