Fix gemspec

From the hotwire derived template

Author: David Heinemeier Hansson

tailwindcss-rails.gemspec

@@ -3,16 +3,15 @@ require_relative "lib/tailwindcss/version"
 Gem::Specification.new do |spec|
   spec.name        = "tailwindcss-rails"
   spec.version     = Tailwindcss::VERSION
-  spec.authors     = [ "Sam Stephenson", "Javan Mahkmali", "David Heinemeier Hansson" ]
+  spec.authors     = [ "David Heinemeier Hansson" ]
   spec.email       = "david@loudthinking.com"
-  spec.homepage    = "https://tailwindcss.hotwire.dev"
-  spec.summary     = "A modest JavaScript framework for the HTML you already have."
+  spec.homepage    = "https://github.com/rails/tailwindcss-rails"
+  spec.summary     = "Integrate Tailwind CSS with the asset pipeline in Rails."
   spec.license     = "MIT"
 
   spec.metadata["homepage_uri"] = spec.homepage
-  spec.metadata["source_code_uri"] = "https://github.com/hotwired/tailwindcss-rails"
 
-  spec.files = Dir["{app,config,db,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
+  spec.files = Dir["{app,lib}/**/*", "MIT-LICENSE", "Rakefile", "README.md"]
 
   spec.add_dependency "rails", ">= 6.0.0"
 end