fix(deps): downgrade theme?

re #12

Gemfile

@@ -11,7 +11,7 @@ source "https://rubygems.org"
 gem "jekyll", "~> 4.0"
 
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
-gem "jekyll-theme-open-project", "~> 2.1.9"
+gem "jekyll-theme-open-project", "~> 2.1.6"
 
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
@@ -23,7 +23,7 @@ group :jekyll_plugins do
   gem "jekyll-data"
   gem "jekyll-asciidoc"
   gem "git"
-  gem "jekyll-theme-open-project-helpers", "~> 2.1.9"
+  gem "jekyll-theme-open-project-helpers", "~> 2.1.6"
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem