feat: persist display and experimental settings on the db

feat: small styles changed

migrations/000007.php

@@ -0,0 +1,15 @@
+<?php
+// This migration adds a new table to store the display and experimental settings
+// This settings will now be persisted across sessions and devices
+
+/** @noinspection PhpUndefinedVariableInspection */
+$db->exec('CREATE TABLE IF NOT EXISTS settings (
+    dark_theme BOOLEAN DEFAULT 0,
+    monthly_price BOOLEAN DEFAULT 0,
+    convert_currency BOOLEAN DEFAULT 0,
+    remove_background BOOLEAN DEFAULT 0
+)');
+
+
+$db->exec('INSERT INTO settings (dark_theme, monthly_price, convert_currency, remove_background) VALUES (0, 0, 0, 0)');
+