remove needless docs and task

Author: rmosolgo

Rakefile

@@ -58,14 +58,6 @@ ERR
   end
 end
 
-desc "Use Racc to regenerate parser.rb from configuration files"
-task :build_parser do
-  assert_dependency_version("Racc", "1.7.1", %|ruby -e "require 'racc'; puts Racc::VERSION"|)
-
-  `rm -f lib/graphql/language/parser.rb `
-  `racc lib/graphql/language/parser.y -o lib/graphql/language/parser.rb`
-end
-
 namespace :bench do
   def prepare_benchmark
     $LOAD_PATH << "./lib" << "./spec/support"

guides/development.md

@@ -163,42 +163,6 @@ GraphQL-Ruby uses a thorough test suite to make sure things work reliably day-af
 
 Don't fret about coding style or organization.  There's a minimal Rubocop config in `.rubocop.yml` which runs during CI. You can run it manually with `bundle exec rake rubocop`.
 
-## Lexer and Parser
-
-The lexer and parser use a multistep build process:
-
-- Write the definition (`lexer.rl` or `parser.y`)
-- Run the generator (Ragel or Racc) to create `.rb` files (`lexer.rb` or `parser.rb`)
-- `require` those `.rb` files in GraphQL-Ruby
-
-To update the lexer or parser, you should update their corresponding _definitions_ (`lexer.rl` or `parser.y`). Then, you can run `bundle exec rake build_parser` to re-generate the `.rb` files.
-
-You will need Ragel to build the lexer (see above).
-
-### Install Ragel and Colm on a Mac
-
-GraphQL Ruby requires Ragel 7.0.0.9 which is not available on Homebrew. To install it, you might have to download it from source.
-
-This is not meant to be a step by step guide and will likely not work as the documentation ages.
-
-Download colm from [http://www.colm.net/files/colm/colm-0.13.0.4.tar.gz](http://www.colm.net/files/colm/colm-0.13.0.4.tar.gz)
-
-Download ragel from [http://www.colm.net/files/ragel/ragel-7.0.0.9.tar.gz](http://www.colm.net/files/ragel/ragel-7.0.0.9.tar.gz)
-
-```sh
-# In colm directory
-cat README # for install instructions
-# The author who added this documentation succeeded with these steps
-./configure
-make
-make install
-
-# After installing colm, in ragel directory
-./configure
-make
-make install
-```
-
 ## Website
 
 To update the website, update the `.md` files in `guides/`.