Add profile directory to web UI (#11688)

* Add profile directory to web UI

* Add a line of bio to the directory

app/controllers/api/v1/directories_controller.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class Api::V1::DirectoriesController < Api::BaseController
+  before_action :require_enabled!
+  before_action :set_accounts
+
+  def show
+    render json: @accounts, each_serializer: REST::AccountSerializer
+  end
+
+  private
+
+  def require_enabled!
+    return not_found unless Setting.profile_directory
+  end
+
+  def set_accounts
+    @accounts = accounts_scope.offset(params[:offset]).limit(limit_param(DEFAULT_ACCOUNTS_LIMIT))
+  end
+
+  def accounts_scope
+    Account.discoverable.tap do |scope|
+      scope.merge!(Account.local)                                          if truthy_param?(:local)
+      scope.merge!(Account.by_recent_status)                               if params[:order].blank? || params[:order] == 'active'
+      scope.merge!(Account.order(id: :desc))                               if params[:order] == 'new'
+      scope.merge!(Account.not_excluded_by_account(current_account))       if current_account
+      scope.merge!(Account.not_domain_blocked_by_account(current_account)) if current_account && !truthy_param?(:local)
+    end
+  end
+end