Update README.md

Author: JulianPrieber

README.md

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-### Optional configuration:
-Optionally, you can change the app name in your ".env" file in the root directory of your LinkStack installation. At the moment this is set to
-APP_NAME="LinkStack" you can change "LinkStack" to what ever you like. This setting defines the page title and welcome message.
-
-For more configuration options, refer to the [documentation](https://linkstack.com/docs/d/configuration-getting-started/).
-
-<br>
-
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 ## Updating