Import latest app updates from streamline

An updated set of source files and initialization was provided by streamline to
address issues observed during initial testing. These files have been updated in
order to generate a new set of app images.

docker/streamline-src/vendor/league/config/src/ConfigurationInterface.php

@@ -1,46 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-/*
- * This file is part of the league/config package.
- *
- * (c) Colin O'Dell <colinodell@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace League\Config;
-
-use League\Config\Exception\UnknownOptionException;
-use League\Config\Exception\ValidationException;
-
-/**
- * Interface for reading configuration values
- */
-interface ConfigurationInterface
-{
-    /**
-     * @param string $key Configuration option path/key
-     *
-     * @psalm-param non-empty-string $key
-     *
-     * @return mixed
-     *
-     * @throws ValidationException if the schema failed to validate the given input
-     * @throws UnknownOptionException if the requested key does not exist or is malformed
-     */
-    public function get(string $key);
-
-    /**
-     * @param string $key Configuration option path/key
-     *
-     * @psalm-param non-empty-string $key
-     *
-     * @return bool Whether the given option exists
-     *
-     * @throws ValidationException if the schema failed to validate the given input
-     */
-    public function exists(string $key): bool;
-}