Adds public notes (#28373)

* Adds public notes

* oops sorry CI

* AA review

* head of staff requests

* darkmode + disclaimer

SQL/updates/64-65.sql

@@ -0,0 +1,5 @@
+# Updating DB from 64-65 ~Contrabang
+# Adds a new column to the notes table for public notes
+ALTER TABLE `notes`
+	ADD COLUMN `public` TINYINT NOT NULL DEFAULT 0 AFTER `deletedby`,
+	ADD INDEX `public` (`public`);