refactor: remove hardcoded credentials from config

- Strip configuration.local.php to logger-only defaults
- Remove db, solr, session, checkfile_url, worker IDs (unused legacy)
- Clean credential comments from logger config files
- Add .env.example template
- Add .env to .gitignore

config/configuration.local.php

@@ -0,0 +1,15 @@
+<?php
+use Bsr\Utils\Logger\Logger;
+
+/**
+ * Default configuration for php-bsrutils library.
+ * Contains only logger defaults needed for the Logger class.
+ * Application-specific config should be in the consuming application's config files.
+ */
+return array(
+    'log' => array(
+        'file' => realpath(dirname(__FILE__) . '/..') . '/log/log.txt',
+        'format' => '%ip% - [%date%] - %status% %error% - %time% - %func%',
+        'verbosity' => Logger::NORMAL,
+    ),
+);