theme fix 2 (#63)

* - update gemfile
 - use the github pages bit

* - remove more bits

Author: msievenpiper

docs/Gemfile

@@ -1,5 +1,6 @@
 source "https://rubygems.org"
 
-gem "jekyll", "~> 4.3"
-gem "just-the-docs"
-gem "webrick" # Required for Ruby 3+
+gem "jekyll", "~> 3.10.0"
+gem "bigdecimal", "~> 4.0"
+gem "github-pages", group: :jekyll_plugins
+gem "jekyll-remote-theme"