routes: remove legacy /user/index and /artist/index API endpoints.

These endpoints get zero traffic.

app/controllers/legacy_controller.rb

@@ -17,18 +17,10 @@ class LegacyController < ApplicationController
     end
   end
 
-  def users
-    @users = User.limit(100).search(params).paginate(params[:page])
-  end
-
   def tags
     @tags = Tag.limit(100).search(params).paginate(params[:page], :limit => params[:limit])
   end
 
-  def artists
-    @artists = Artist.limit(100).search(search_params).paginate(params[:page])
-  end
-
   def unavailable
     render :plain => "this resource is no longer available", :status => 410
   end

app/models/user.rb

@@ -483,15 +483,6 @@ class User < ApplicationRecord
       ]
     end
 
-    def to_legacy_json
-      return {
-        "name" => name,
-        "id" => id,
-        "level" => level,
-        "created_at" => created_at.strftime("%Y-%m-%d %H:%M")
-      }.to_json
-    end
-
     def api_token
       api_key.try(:key)
     end

app/views/legacy/artists.json.erb

@@ -1 +0,0 @@
-[<%= raw @artists.map(&:to_json).join(",") %>]

app/views/legacy/artists.xml.erb

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<artists type="array">
-  <% @artists.each do |artist| %>
-    <artist group_name="<%= artist.group_name %>" other_names="<%= artist.other_names %>" urls="<%= artist.urls.map {|x| x.url}.join(" ") %>" is_active="<%= !artist.is_deleted? %>" name="<%= artist.name %>" updater_id="0" id="<%= artist.id %>" version="0"/>
-  <% end %>
-</artists>

app/views/legacy/users.json.erb

@@ -1 +0,0 @@
-[<%= @users.map {|x| x.to_legacy_json}.join(", ").html_safe %>]

app/views/legacy/users.xml.erb

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<users type="array">
-  <% @users.each do |user| %>
-    <user name="<%= user.name %>" id="<%= user.id %>" created_at="<%= user.created_at.strftime('%Y-%m-%d %H:%M') %>" level="<%= user.level %>"></user>
-  <% end %>
-</users>