rails up to 7.0and ruby to 2.7.2

mv lib to app/lib due to upgrade

removing concerns from autoload path

resolve zeitwerk issues

make foodsoft run for dev on rails 7 and ruby 2.7

fix mail file permission bug

fix database_config

fix articles controller test ActiveModell::Error

bump Gemfile.lock

config/initializers/zeitwerk.rb

@@ -0,0 +1,5 @@
+# config/initializers/zeitwerk.rb
+ActiveSupport::Dependencies
+  .autoload_paths
+  .delete("#{Rails.root}/app/controllers/concerns")
+