Merge pull request #1128 from db-ui/docs-optimizations

docs: optimizations by mentioning v3

Author: mfranzke

README.md

@@ -19,9 +19,14 @@
 
 <!-- ![Pipeline status](https://github.com/db-ui/core/badges/main/pipeline.svg?style=flat) -->
 
+> [!IMPORTANT]
+> We've released the new stable version of the [DB UX Design System v3](https://github.com/db-ux-design-system/core-web), which is the successor of this generation of DB Design Systems.
+> Especially for new projects, we strongly recommend building on [DB UX Design System v3](https://github.com/db-ux-design-system/core-web).
+> The new version has some great benefits and optimisations, especially in terms of accessibility testing, further and better framework support and ongoing development.
+
 > [!WARNING]
 > We've tried a [quick migration to newer SCSS syntax like e.g. `@use` instead of the nowadays deprecated `@import`](https://github.com/db-ui/core/issues/994), but this seems to be more complicated than expected.
-> You might face several warnings on the console when using SASS with our packages regarding `@import` usage. If you'd like to prevent those, you might as well want to evaluate migrating to our newer version of the DB UX Design System v2: <https://github.com/db-ui/mono>
+> You might face several warnings on the console when using SASS with our packages regarding `@import` usage. If you'd like to prevent those, you might as well want to evaluate migrating to our newer version of the DB UX Design System: <https://github.com/db-ux-design-system/core-web>
 
 DB Personenverkehr and DB Systel have merged their Design Systems for Web [with DB UX Design System v2](https://marketingportal.extranet.deutschebahn.com/marketingportal/Design-Anwendungen/db-ux-design-system/version-2/Components) as their successor. Our goal is to provide a common UX based on the [DB "Moderne Ikone"](https://marketingportal.extranet.deutschebahn.com/marketingportal/Marke-und-Design#) for customer and employee applications. To achieve an end 2 end consistence from conception to implementation, we bring you this new version of DB UI Core (npm: `@db-ui/core`), that is being used within a Design System by S.R (Reisendeninformation) as well.
 

source/_patterns/01-elements/_form-elements.scss

@@ -91,7 +91,7 @@
 
 // Validation
 // We need to differentiate here because of any non-textual input elements like select, radio and checkbox, that we couldn't handle by :placeholder-shown
-// TODO: maybe we could totally restructure this, work with a :not(select) instead, differentiate in between user-invalid and provide a fallback (https://github.com/db-ui/mono/pull/893), etc.
+// TODO: maybe we could totally restructure this, work with a :not(select) instead, differentiate in between user-invalid and provide a fallback (https://github.com/db-ux-design-system/core-web/pull/893), etc.
 %form-element-validation {
 	&:not([aria-invalid]) {
 		&:user-valid {