CMS 2.0 - Theme engine, logging, admin improvements

Major changes:
- New ThemeManager with Twig templating and SCSS compilation
- Dynamic themes system (themes/default, themes/demo)
- LogManager with SQLite storage and syslog forwarding
- RequestLogger with static helper methods
- Admin UI overhaul (Bootstrap 5, dark mode)
- Admin config page with logging and theme settings
- Admin logs page with filters and search
- Removed legacy Mustache templates
- Removed test plugin and theme
- Composer dependencies: Twig, scssphp, CommonMark, MaxMind GeoIP

vendor/psr/http-factory/README.md

@@ -0,0 +1,12 @@
+HTTP Factories
+==============
+
+This repository holds all interfaces related to [PSR-17 (HTTP Factories)][psr-url].
+
+Note that this is not a HTTP Factory implementation of its own. It is merely interfaces that describe the components of a HTTP Factory.
+
+The installable [package][package-url] and [implementations][implementation-url] are listed on Packagist.
+
+[psr-url]: https://www.php-fig.org/psr/psr-17/
+[package-url]: https://packagist.org/packages/psr/http-factory
+[implementation-url]: https://packagist.org/providers/psr/http-factory-implementation