Add custom theme file

Need to temporarily allow (it seems) for custom block templates

TODO: Move enabling code *out* of custom theme somehow.

web/themes/custom/agarica/agarica.theme

@@ -0,0 +1,18 @@
+<?php
+
+// TODO: Make this file unnecessary because we will not allow deploying code to the platform
+
+
+/**
+ * Implements hook_theme_suggestions_HOOK_alter for blocks.
+ *
+ * See "Inheriting Block Templates" in
+ * https://www.drupal.org/docs/8/theming-drupal-8/creating-a-drupal-8-sub-theme-or-sub-theme-of-sub-theme
+ */
+function family_home_theme_suggestions_block_alter(&$suggestions, $variables) {
+
+  // Load theme suggestions for blocks from parent theme.
+  foreach ($suggestions as &$suggestion) {
+    $suggestion = str_replace('family_home_', 'octavia_', $suggestion);
+  }
+}