Why is my completely new Jekyll blog blank when I add the supported Hacker theme? - jekyll

Question

I am trying to get started with a Jekyll blog. I followed these instructions to setup the blog using the default minima theme. This actually worked without any problems, but I wanted to change to the Hacker theme. To do that it simply asks for the following changes to me _config.yml:
remote_theme: pages-themes/hacker#v0.2.0
plugins:
- jekyll-remote-theme # add this line to the plugins list if you already have one
After making these changes I went to the URL https://galenseilis.github.io/ where I see that nothing renders anymore.
The current state can be observed at https://github.com/galenseilis/galenseilis.github.io, but everything should be the default values except where I made changes to the Gemfile and _config.yml. But since I may change the content of the repo as I troubleshoot, so here is a snapshot of these files:
Gemfile
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", "~> 4.3.2"
# This is the default theme for new Jekyll sites. You may change this to anything you like.
# gem "minima", "~> 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
# If you have any plugins, put them here!
group :jekyll_plugins do
gem "jekyll-feed", "~> 0.12"
end
# Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
# and associated library.
platforms :mingw, :x64_mingw, :mswin, :jruby do
gem "tzinfo", ">= 1", "< 3"
gem "tzinfo-data"
end
# Performance-booster for watching directories on Windows
gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
# Lock `http_parser.rb` gem to `v0.6.x` on JRuby builds since newer versions of the gem
# do not have a Java counterpart.
gem "http_parser.rb", "~> 0.6.0", :platforms => [:jruby]
_config.yml
title: Your awesome title
email: your-email#example.com
description: >- # this means to ignore newlines until "baseurl:"
Write an awesome description for your new site here. You can edit this
line in _config.yml. It will appear in your document head meta (for
Google search results) and in your feed.xml site description.
baseurl: "" # the subpath of your site, e.g. /blog
url: "" # the base hostname & protocol for your site, e.g. http://example.com
twitter_username: jekyllrb
github_username: jekyll
# Build settings
# theme: minima
# theme: jekyll-theme-hacker
remote_theme: pages-themes/hacker#v0.2.0
plugins:
- jekyll-feed
- jekyll-remote-theme
Reverting the recommended changes for the Hacker theme back to the original state using minima theme returns the rending of the page. So maybe the changes I have made are insufficient if not incorrect somehow?