Revert "Merge pull request #89 from happy-software/rails_update"

This reverts commit e684df3, reversing
changes made to cc57f41.

Gemfile

@@ -4,11 +4,11 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 ruby File.open('.ruby-version', 'rb') { |f| f.read.chomp }
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 7.2'
+gem 'rails', '~> 6.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 6.4'
+gem 'puma', '~> 5.6.8'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 6.0.0'
 # Use Uglifier as compressor for JavaScript assets
@@ -27,7 +27,7 @@ gem 'bootsnap', '>= 1.1.0', require: false
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
-  gem 'rspec-rails', '~> 6.1.0'
+  gem 'rspec-rails', '~> 4.0.0'
   gem 'rspec'
 end