Configure where to put the dependencies, here in a subdirectory 'vendor/bundle' in the current directory:

bundle config set --local path 'vendor/bundle'

Fetch and install the dependencies:

$ bundle install

Then you can build and run the development web server:

$ bundle exec jekyll serve

The website can be accessed at http://localhost:4000 and the development server will watch the directory for changes and rebuild.

• _data/navigation.yml defines the menu