Remove: #55 アンテナ新規作成ボタンを除去

app/views/antennas/index.html.haml

@@ -1,9 +1,6 @@
 - content_for :page_title do
   = t('antennas.index.title')
 
-- content_for :heading_actions do
-  = link_to t('antennas.new.title'), new_antenna_path, class: 'button'
-
 - if @antennas.empty?
   .muted-hint.center-text= t 'antennas.index.empty'
 - else