Resurrect old ruby project

1. Upgrade rbenv - check version of rbenv and upgrade if necessary using brew
2. Upgrade ruby - check current version of ruby being used by rbenv and upgrade if necessary

# show current installed versions
rbenv versions

# list available versions
rbenv install -l

# install latest available version
rbenv install 3.2.2

# set version to be used
rbenv global 3.2.2

1. Open terminal in ruby project, install gems with bundle install
2. If message show that this involved downgrading bundler, then consider bundle upgrade --bundler to upgrade
3. Update the pinned gems in the Gemfile to the lastest version and go for a bundle update jekyll
4. bundle exec jekyll serve