removed "add person" block config (not working)

Also changed Person Search no results behaviour (to use the missing block, but that's ok - it should alert that it's missing, and it's easy to recreate.

config/optional/block.block.linkforcreatinganewperson.yml

@@ -1,24 +0,0 @@
-langcode: en
-status: true
-dependencies:
-  content:
-    - 'block_content:basic:8b172f25-b43d-4094-8c03-7e0aee97e057'
-  module:
-    - block_content
-  theme:
-    - bartik
-id: linkforcreatinganewperson
-theme: bartik
-region: sidebar_first
-weight: 0
-provider: null
-plugin: 'block_content:8b172f25-b43d-4094-8c03-7e0aee97e057'
-settings:
-  id: 'block_content:8b172f25-b43d-4094-8c03-7e0aee97e057'
-  label: 'Link for creating a new person'
-  provider: block_content
-  label_display: '0'
-  status: true
-  info: ''
-  view_mode: full
-visibility: {  }