Condense Database Migrations (#17103)

* Condense Database Migrations

Condenses the Database Migrations into a new initial schema.
Also adds some instructions to the Database Readme for existing setups.

* Update readme/delete changed migrations since pr creation

* Reworks a bit how the previous migrations are handled and updates the instructions accordingly

* Expand the readme with baseline/migrate

---------

Co-authored-by: Werner <Arrow768@users.noreply.github.com>

SQL/migrate-2017/V036__Docs.sql

@@ -0,0 +1,20 @@
+--
+-- Create the Documents database.
+--
+
+CREATE TABLE `ss13_documents` (
+	`id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
+	`name` VARCHAR(100) NOT NULL,
+	`title` VARCHAR(26) NOT NULL,
+	`chance` FLOAT UNSIGNED NOT NULL DEFAULT '1',
+	`content` VARCHAR(3072) NOT NULL,
+	`tags` JSON NOT NULL,
+	`created_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+	`updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+	`deleted_at` DATETIME NULL DEFAULT NULL,
+	PRIMARY KEY (`id`),
+	UNIQUE INDEX `name` (`name`)
+)
+COLLATE='utf8_bin'
+ENGINE=InnoDB
+;