Remove title and description from services

After removing and ignoring the title and description columns from the
code in 0000e049, we can now drop the database columns.

changelogs/unreleased/217587-remove-title-and-description-from-services.yml

+---
+title: Remove title and description columns from services table
+merge_request: 37936
+author:
+type: other

db/post_migrate/20200727114147_remove_title_and_description_from_services.rb

+# frozen_string_literal: true
+
+class RemoveTitleAndDescriptionFromServices < ActiveRecord::Migration[6.0]
+  DOWNTIME = false
+
+  def change
+    remove_column :services, :title, :string
+    remove_column :services, :description, :string, limit: 500
+  end
+end

db/schema_migrations/20200727114147

+fd85556cfed27a08aa01a8ee5b4eecfb1de7011b2fcb5c613cf21b9f42e728b9
\ No newline at end of file

db/structure.sql

@@ -15276,7 +15276,6 @@ CREATE TABLE public.service_desk_settings (
 CREATE TABLE public.services (
     id integer NOT NULL,
     type character varying,
-    title character varying,
     project_id integer,
     created_at timestamp without time zone,
     updated_at timestamp without time zone,
@@ -15296,7 +15295,6 @@ CREATE TABLE public.services (
     job_events boolean DEFAULT false NOT NULL,
     confidential_note_events boolean DEFAULT true,
     deployment_events boolean DEFAULT false NOT NULL,
-    description character varying(500),
     comment_on_event_enabled boolean DEFAULT true NOT NULL,
     template boolean DEFAULT false,
     instance boolean DEFAULT false NOT NULL,