Enable & configure block class module and set search bar to be hidden on mobile

We have a search icon that already appears only on mobile.

Ref #114 #121

config/sync/block_class.settings.yml

@@ -0,0 +1,23 @@
+_core:
+  default_config_hash: XEpuHrBp3DELKxVx0tmwE6CS7NSIKXu4F6QhT_vwqd0
+maxlength_block_class_field: 255
+field_type: multiple_textfields
+default_case: lowercase
+block_classes_stored:
+  - is-hidden-mobile
+enable_attributes: true
+enable_auto_complete: true
+qty_classes_per_block: 10
+items_per_page: 50
+enable_special_chars: false
+qty_attributes_per_block: 10
+enable_id_replacement: true
+weight_attributes: null
+weight_class: null
+weight_id: null
+filter_html_clean_css_identifier: ''
+maxlength_attributes: 255
+maxlength_id: 255
+attribute_keys_stored: '[]'
+attribute_value_stored: '[]'
+attributes_inline: '[]'