Add ruby/rack docs

Author: thedanbob

docs/file-scrapers.md

@@ -270,6 +270,17 @@ bundle exec rake docs
 cp -r docs $DEVDOCS/docs/minitest
 ```
 
+### Ruby / Rack
+
+```sh
+git clone https://github.com/rack/rack
+cd rack/
+sed -i 's/gem "rdoc"/gem "rdoc", "<7"/' Gemfile
+bundle install
+bundle exec rdoc
+cp -r doc $DEVDOCS/docs/rack
+```
+
 ### Ruby on Rails
 * Run `git clone --branch v$RELEASE --depth 7 https://github.com/rails/rails.git && cd rails`
 * Open `railties/lib/rails/api/task.rb` and comment out any code related to sdoc (`configure_sdoc`)

lib/docs/scrapers/rdoc/rack.rb

@@ -0,0 +1,23 @@
+module Docs
+  class Rack < Rdoc
+
+    self.name = 'Ruby / Rack'
+    self.slug = 'rack'
+    self.release = '3.2.6'
+    self.links = {
+      home: 'https://rack.github.io/rack/3.2/index.html',
+      code: 'https://github.com/rack/rack'
+    }
+
+    options[:root_title] = 'Rack'
+
+    options[:attribution] = <<-HTML
+      &copy; 2007-2021 Leah Neukirchen<br>
+      Licensed under the MIT License.
+    HTML
+
+    def get_latest_version(opts)
+      get_latest_github_release('rack', 'rack', opts)
+    end
+  end
+end

public/icons/docs/rack/16.png

@@ -0,0 +1 @@
+https://github.com/rack/rack/blob/main/contrib/logo.webp