feat: add multi email recipients
feat: add option for also showing the original price on the dashboard
feat: open edit form after cloning subscription
fix: typo on export subscriptions to csv
chore: removed version line from docker-compose file
fix: don't allow saving main and accent colors if they're the same
feat: rework styles of theme section on settings page
feat: more uniform and aligned styles on the settings page
feat: ability to add custom css styles
refactor: run linter and cleanup php files
fix: not every payment cycle was shown on the calendar
feat: also show previous payments on the calendar for the current month
