Add PHP 8.0 support

Update composer and PHP libraries
Require PHP >=7.2 or >=8.0

Added main ID attribute

Added the ID attribute to the styleguide's template Body tag.

1.0.26

Merge branch 'master' of https://github.com/wearenolte/lean-theme-sty…

PHP version 7.2

PHP version 7.2 for better compatibility with other packages.