changed gemfile

Author: AndreasGerken

Gemfile

@@ -1,19 +1,9 @@
 source "https://rubygems.org"
-gem "ffi", "1.16.3"
-# 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", ">= 4.2", "< 5"
 
-# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
-# uncomment the line below. To upgrade, run `bundle update github-pages`.
-gem "github-pages", group: :jekyll_plugins
+gem "jekyll", "~> 4.3"
 
-gem "jekyll-scholar", "~> 7.1", group: :jekyll_plugins
-
-#gem "liquid", "~> 4.0"
+group :jekyll_plugins do
+  gem "jekyll-feed"
+  gem "jekyll-sitemap"
+  gem "jekyll-scholar", "~> 7.1"
+end