Replace haml-rails gem with haml

The former is not used.

Gemfile

@@ -25,9 +25,6 @@ gem 'paper_trail', '~> 4.0'
 # 0.7.3 is the latest for Rails 4.2, however, it is absent on Rubygems server
 # https://github.com/huacnlee/rails-settings-cached/issues/165
 gem 'rails-settings-cached', '0.7.2'
-
-# html-xml
-gem 'haml-rails', '0.9.0' # haml for views
 gem 'nokogiri'
 
 # style
@@ -91,6 +88,7 @@ gem 'company_register', github: 'internetee/company_register', branch: :master
 gem 'e_invoice', github: 'internetee/e_invoice', branch: :master
 gem 'lhv', github: 'internetee/lhv', tag: 'v0.1.0'
 gem 'domain_name'
+gem 'haml'
 
 group :development do
   # deploy

Gemfile.lock

@@ -203,12 +203,6 @@ GEM
       builder (>= 2.1.2)
     haml (4.0.7)
       tilt
-    haml-rails (0.9.0)
-      actionpack (>= 4.0.1)
-      activesupport (>= 4.0.1)
-      haml (>= 4.0.6, < 5.0)
-      html2haml (>= 1.0.1)
-      railties (>= 4.0.1)
     hashdiff (1.0.0)
     hpricot (0.8.6)
     html2haml (2.1.0)
@@ -481,7 +475,7 @@ DEPENDENCIES
   factory_bot_rails
   figaro (= 1.1.1)
   grape
-  haml-rails (= 0.9.0)
+  haml
   html2haml (= 2.1.0)
   isikukood
   iso8601 (= 0.8.6)