Remove all manual gem/bundler management commands

Author: jedisct1

.github/workflows/jekyll-gh-pages.yml

@@ -29,16 +29,12 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: '3.3'
-          bundler-cache: false
+          bundler-cache: true
           working-directory: www
 
       - name: Build with Jekyll
         run: |
           cd www
-          gem update --system
-          gem install bundler
-          bundle update --bundler
-          bundle install
           # Build Jekyll site with baseurl set to empty string
           JEKYLL_ENV=production bundle exec jekyll build --baseurl=""
         env: