a new start

Gemfile

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+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+# Hello! This is where you manage which Jekyll version is used to run.
+# When you want to use a different version, change it below, save the
+# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
+#
+#     bundle exec jekyll serve
+#
+# This will help ensure the proper Jekyll version is running.
+# Happy Jekylling!
+gem 'jekyll', '~> 4.4'
+
+# If you are part of the ["Customers" team](https://github.com/orgs/hydecorp/teams/pro-customers),
+# you can fetch the theme from a private repository.
+# See [Deploy in the pivoine Docs](https://pivoine.com/docs/deploy) for details.
+
+# gem "jekyll-theme-pivoine", git: "https://github.com/hydecorp/pivoine-pro", tag: "pro/v9.2.0"
+
+# IMPORTANT: The followign gem is used to compile math formulas to
+# KaTeX during site building.
+#
+# There are a couple of things to know about this gem:
+# *  It is not supported on GitHub Pages.
+#    You have to build the site on your machine before uploading to GitHub,
+#    or use a more permissive cloud building tool such as Netlify.
+# *  You need some kind of JavaScript runtime on your machine.
+#    Usually installing NodeJS will suffice.
+#    For details, see <https://github.com/kramdown/math-katex#documentation>
+#
+# If you're using the MathJax math engine instead, free to remove the line below:
+gem 'kramdown-math-katex'
+
+# A JavaScript runtime for Ruby that helps with running the katex gem above.
+gem 'duktape'
+
+# Required for `jekyll serve` in Ruby 3
+gem 'webrick'
+
+# Uncomment when using the `--lsi` option for `jekyll build`
+gem "classifier-reborn"
+
+group :jekyll_plugins do
+  gem 'jekyll-sass-converter'
+  gem 'jekyll-compose'
+  gem 'jekyll-default-layout'
+  gem 'jekyll-feed'
+  gem 'jekyll-include-cache'
+  gem 'jekyll-last-modified-at'
+  gem 'jekyll-optional-front-matter'
+  gem 'jekyll-paginate-v2'
+  gem 'jekyll-readme-index'
+  gem 'jekyll-redirect-from'
+  gem 'jekyll-relative-links'
+  gem 'jekyll-seo-tag'
+  gem 'jekyll-sitemap'
+  gem 'jekyll-titles-from-headings'
+end
+
+gem 'tzinfo-data' if Gem.win_platform?
+gem 'wdm' if Gem.win_platform?