Bug fixes

Fixed one small bug with the URI alter - wrong variable name passed.

Applied patches from: -

Fixes JS error on Drupal side: https://www.drupal.org/project/bootstrap_storybook/issues/3121498
Adds documentation for subtheme updates
Defines composer.json and theme dependencies

Solves issues

1. Issue #3122535 by prabha1997, Drupal 9 Readiness
2. Issue #3122532 by prabha1997, t() calls should be avoided in classes, use dependency injection and $this->t() instead
3. Issue #3122527 by prabha1997, All dependencies must be prefixed with the project name, for example "drupal:"

Bugfix for #3122352: Unable to install modules gin due to missing modules gin. & other small improvements

Development version

Fix another issue with the Responsive SVG Image Formatter