Ad S3 storage block to Pixelfed .env file

## S3 Configuration (Post-Installer)
PF_ENABLE_CLOUD=true
FILESYSTEM_DRIVER=local
FILESYSTEM_CLOUD=s3
AWS_ACCESS_KEY_ID=[KEY_ID]
AWS_SECRET_ACCESS_KEY=[KEY_SECRET]
AWS_DEFAULT_REGION=[REGION]
AWS_BUCKET=metapixl-media
AWS_ENDPOINT=[URL_TO_S3_STORAGE]
AWS_USE_PATH_STYLE_ENDPOINT=true

Enable Cloud storage in admin dashboard

Run this command to migrate media to S3 storage

php artisan media:migrate2cloud

Move avatar storage to S3 with this command

php artisan avatar:storage