Sample configuration files for WordPress as Git submodule.

.htaccess

# BEGIN WordPress
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /

    # Prevent requests to index.php from being rewritten
    RewriteRule ^index\.php$ - [L]

    # Prefix specified PHP files with 'wordpress'
    RewriteRule ^((wp-login|xmlrpc)\.php) wordpress/$1 [R=301,L]

    # Prefix wp-admin and wp-includes with 'wordpress'
    RewriteRule ^(wp-(admin|includes).*) wordpress/$1 [L]

    # Resolve uploaded files
    RewriteRule ^files/(.+) wordpress/wp-includes/ms-files.php?file=$1 [L]

    # Route non-files and non-directories to root's index.php
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . index.php [L]
</IfModule>
# END WordPress

index.php

<?php

/** Enable/disable WordPress themes */
define('WP_USE_THEMES', true);

/** Load WordPress environment and template */
require './wordpress/wp-blog-header.php';

// EOF

wp-config.php

<?php

/**
 * Set constants based on environment
 *
 * DB_NAME          Database name
 * DB_USER          Database username
 * DB_PASSWORD      Database password
 * DB_HOST          Database hostname
 * FORCE_SSL_ADMIN  Enable/disable SSL on login and in admin
 * WP_DEBUG         Enable/disable WordPress debugging
 */

$environment = '';
if (isset($_SERVER['APP_ENVIRONMENT'])) {
	$environment = $_SERVER['APP_ENVIRONMENT'];
}
switch ($environment) {
	case 'LOCALHOST':
		define('DB_NAME', '');
		define('DB_USER', '');
		define('DB_PASSWORD', '');
		define('DB_HOST', 'localhost');
		define('FORCE_SSL_ADMIN', true);
		define('WP_DEBUG', true);
		break;

	case 'DEVELOPMENT':
		define('DB_NAME', '');
		define('DB_USER', '');
		define('DB_PASSWORD', '');
		define('DB_HOST', 'localhost');
		define('FORCE_SSL_ADMIN', true);
		define('WP_DEBUG', true);
		break;

	case 'STAGING':
		define('DB_NAME', '');
		define('DB_USER', '');
		define('DB_PASSWORD', '');
		define('DB_HOST', 'localhost');
		define('FORCE_SSL_ADMIN', true);
		define('WP_DEBUG', false);
		break;

	default:
		define('DB_NAME', '');
		define('DB_USER', '');
		define('DB_PASSWORD', '');
		define('DB_HOST', 'localhost');
		define('FORCE_SSL_ADMIN', true);
		define('WP_DEBUG', false);
		break;
}

/**
 * Database settings
 */

/** Database character set  */
define('DB_CHARSET', 'utf8');

/** Database collation */
define('DB_COLLATE', '');

/** Database table prefix */
$table_prefix  = 'wp_';

/**
 * WordPress settings
 */

/** WordPress.com API key */
define('WPCOM_API_KEY', '');

/** URL to WordPress site */
//define('WP_HOME', 'http://' . $_SERVER['SERVER_NAME']);

/** URL to WordPress installation */
//define('WP_SITEURL', WP_HOME . '/wordpress');

/** Absolute path to wp-content directory */
define('WP_CONTENT_DIR', $_SERVER['DOCUMENT_ROOT'] . '/wp-content');

/** URL to wp-content directory */
define('WP_CONTENT_URL', 'http://' . $_SERVER['SERVER_NAME'] . '/wp-content');

/** Slug of default WordPress theme */
//define('WP_DEFAULT_THEME', 'twentyfourteen');

/** Number of seconds between autosaves */
define('AUTOSAVE_INTERVAL', 300);

/** Number of days before trash is emptied */
define('EMPTY_TRASH_DAYS', 30);

/** Maximum number of post revisions to keep */
define('WP_POST_REVISIONS', 5);

/** Enable/disable plugin and theme editor */
define('DISALLOW_FILE_EDIT', true);

/** Enable/disable plugin and theme installation/update */
define('DISALLOW_FILE_MODS', true);

/** Enable/disable WordPress cron */
define('DISABLE_WP_CRON', true);

/** Enable/disable WordPress auto-update */
define('WP_AUTO_UPDATE_CORE', false);

/** WordPress language */
define('WPLANG', '');

/** Enable/disable WordPress multisite functionality */
define('WP_ALLOW_MULTISITE', true);

/**
 * Multisite settings (AFTER it has been enabled)
 */

/** Enable/disable WordPress multisite */
define('MULTISITE', true);

if (defined('MULTISITE') && MULTISITE) {

	/** Configure multisite with subdomains (true) or subdirectories (false) */
	define('SUBDOMAIN_INSTALL', true);

	/** Domain name of default WordPress website */
	define('DOMAIN_CURRENT_SITE', $_SERVER['SERVER_NAME']);

	/** Path to default WordPress website */
	define('PATH_CURRENT_SITE', '/');

	/** Site ID of default multisite network */
	define('SITE_ID_CURRENT_SITE', 1);

	/** Blog ID of default WordPress website */
	define('BLOG_ID_CURRENT_SITE', 1);

	/** Domain name of where to direct non-existant websites */
	define('NOBLOGREDIRECT', 'http://' . $_SERVER['SERVER_NAME']);
}

/**
 * Debugging settings
 */

if (defined('WP_DEBUG') && WP_DEBUG) {

	/** Enable/disable writing error to debug.log in wp-content directory */
	define('WP_DEBUG_LOG', true);

	/** Enable/disable displaying error messages */
	define('WP_DEBUG_DISPLAY', true);

	/** Enable/disable minification of styles and scripts */
	define('SCRIPT_DEBUG', true);

	/** Enable/disable saving database queries */
	define('SAVEQUERIES', true);

	/** Enable/disable concatentation of script files */
	define('CONCATENATE_SCRIPTS', false);
}

/**
 * W3 Total Cache
 */

/** Enable/disable W3 Total Cache */
define('WP_CACHE', true);

/**
 * WordPress keys and salts
 * https://api.wordpress.org/secret-key/1.1/salt/
 */

define(
	'AUTH_KEY',
	''
);
define(
	'SECURE_AUTH_KEY',
	''
);
define(
	'LOGGED_IN_KEY',
	''
);
define(
	'NONCE_KEY',
	''
);
define(
	'AUTH_SALT',
	''
);
define(
	'SECURE_AUTH_SALT',
	''
);
define(
	'LOGGED_IN_SALT',
	''
);
define(
	'NONCE_SALT',
	''
);

/**
 * Misc. WordPress configuration
 */

/** Absolute path to WordPress directory */
if (!defined('ABSPATH')) {
	define('ABSPATH', dirname(__FILE__) . '/');
}

/** Setup WordPress vars and include files */
require_once ABSPATH . 'wp-settings.php';

// EOF

I really, really like this, but I am having a heckuva time figuring out how I can get multisite working as subdomains here... Is there anything I am missing? I keep getting redirect loops when I setup my child sites (I'm trying to use folders instead of subdomains, fwiw), though I would be happy to have my main site as www.mysite.ca and my child site at childsite.mysite.ca, but I can't seem to figure out how to have my main site at www. and my childsite not at childsite.www.