docs: outline EOS for v1 (#7619)

Author: Lukas742

README.md

@@ -80,9 +80,9 @@ To consume `ui5-webcomponents-react`, you need to install the npm modules and re
 npm install @ui5/webcomponents-react @ui5/webcomponents @ui5/webcomponents-fiori
 ```
 
-## Ongoing Support for Version 1.x
+## End of Support for Version 1.x
 
-We will continue to support version 1.x until end of June 2025, focusing on bug fixes to ensure continuity for our existing users.
+The support for version 1.x of `ui5-webcomponents-react` has ended on **July 1, 2025**. We recommend migrating to version 2.x as soon as possible. For more information, please refer to our [Migration Guide](https://sap.github.io/ui5-webcomponents-react/v2/?path=/docs/migration-guide--docs).
 
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docs/Welcome.mdx

@@ -29,11 +29,9 @@ In addition to that, UI5 Web Components for React is providing complex component
 - [Node.js](https://nodejs.org/) (**LTS version**)
 - If you're using [TypeScript](https://www.typescriptlang.org/) we recommend version **4.7** or later.
 
-## Ongoing Support for Version 1.x
+## End of Support for Version 1.x
 
-We will continue to support version 1.x until **end of June 2025**, focusing on bug fixes to ensure continuity for our existing users.
-
-[V1 Release Documentation](https://sap.github.io/ui5-webcomponents-react/v1/?path=/docs/getting-started--docs)
+The support for version 1.x of `ui5-webcomponents-react` has ended on **July 1, 2025**. We recommend migrating to version 2.x as soon as possible. For more information, please refer to our [Migration Guide](?path=/docs/migration-guide--docs).
 
 ## Getting Started