[DOCS] Updates README and links to elasticsearch-dsl

Closes #1026

Author: picandocodigo

Diff for: README.md

@@ -1,4 +1,4 @@
-# Elasticsearch
+# Elasticsearch Rails
 
 [![Ruby 2.7](https://github.com/elastic/elasticsearch-rails/workflows/Ruby%202.7/badge.svg)](https://github.com/elastic/elasticsearch-rails/actions)
 [![Ruby 2.6](https://github.com/elastic/elasticsearch-rails/workflows/Ruby%202.6/badge.svg)](https://github.com/elastic/elasticsearch-rails/actions)

Diff for: elasticsearch-model/README.md

@@ -343,7 +343,7 @@ response.results.first.title
 # => "Quick brown fox"
 ```
 
-Also, you can use the [**`elasticsearch-dsl`**](https://github.com/elastic/elasticsearch-ruby/tree/main/elasticsearch-dsl) library, which provides a specialized Ruby API for the Elasticsearch Query DSL:
+Also, you can use the [**`elasticsearch-dsl`**](https://github.com/elastic/elasticsearch-dsl-ruby) library, which provides a specialized Ruby API for the Elasticsearch Query DSL:
 
 ```ruby
 require 'elasticsearch/dsl'

Diff for: elasticsearch-rails/lib/rails/templates/04-dsl.rb

@@ -27,7 +27,7 @@
 ## [4] DSL
 
 The `dsl` template refactors the search definition in SearchController#index
-to use the [`elasticsearch-dsl`](https://github.com/elastic/elasticsearch-ruby/tree/dsl/elasticsearch-dsl)
+to use the [`elasticsearch-dsl`](https://github.com/elastic/elasticsearch-dsl-ruby)
 Rubygem for better expresivity and readability of the code.
 
 README
@@ -44,7 +44,7 @@
 say_status  "Rubygems", "Adding Rubygems into Gemfile...\n", :yellow
 puts        '-'*80, ''; sleep 0.25
 
-gem "elasticsearch-dsl", git: "git://github.com/elastic/elasticsearch-ruby.git"
+gem "elasticsearch-dsl", git: "git://github.com/elastic/elasticsearch-dsl-ruby.git"
 
 git add:    "Gemfile*"
 git commit: "-m 'Added the `elasticsearch-dsl` gem'"