matminimal admin theme ready

web/themes/custom/matminimal/config/optional/block.block.matminimal_content.yml

@@ -0,0 +1,19 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - system
+  theme:
+    - matminimal
+id: matminimal_content
+theme: matminimal
+region: content
+weight: 0
+provider: null
+plugin: system_main_block
+settings:
+  id: system_main_block
+  label: 'Main page content'
+  provider: system
+  label_display: '0'
+visibility: {  }