fix: update peer dependencies to version 21.0.0

Merge remote-tracking branch 'origin/main'

fix(docs): update README files to correct demo links, improve forma… (#…

…138)

…tting, and remove unnecessary whitespace

fix: update ngx-print directive for improved type safety (#136)

fix(buttons): inject DOCUMENT in button directives for improved DOM a… (

#134)

…ccess

feat: add directives for all buttons (#133)

feat(api): adds directive closeButton and update buttons demo with ne… (

#132)

…w Close Button component

feat(core): Refactor store and update Angular dependencies (#130)

Enhance the Store class with initialization and clear methods, and update data types to allow null. Add return types to methods in the EntityStore and Store classes. Update Angular dependencies to the latest patch versions.

fix: rename custom flex classes to app prefix for consistency (#129)

feat: update version to 20.3.0 in package.json files (#128)