erb_linting (#637)

* setup lint

* lint pass

* gh ci/cd lint

* okay nvm our code is shit

Gemfile

@@ -115,6 +115,9 @@ group :development, :test do
   # Static analysis for security vulnerabilities [https://brakemanscanner.org/]
   gem "brakeman", require: false
 
+  # ERB linting [https://github.com/Shopify/erb_lint]
+  gem "erb_lint", require: false
+
   # Omakase Ruby styling [https://github.com/rails/rubocop-rails-omakase/]
   gem "rubocop-rails-omakase", require: false
 end