Add hint for double loaded lovelace resources

docs/setup/download.md

@@ -3,7 +3,7 @@ title: Prepare & Download
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+<!-- markdownlint-disable MD046 -->
 Before get started on anything, make sure you have created a backup of your home assistant configuration.
 
 > In case you experience problems during installation please reach join the [Discord Server](https://discord.gg/TPXg9b7GfR).

docs/setup/installation.md

@@ -3,7 +3,7 @@ title: Installation
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+<!-- markdownlint-disable MD046 -->
 ## Install Integration
 
 Open your Home Assistant instance and start setting up "UI Lovelace Minimalist" under "Configuration" --> "Devices & Services". Or you can use the My Home Assistant Button bellow.
@@ -21,6 +21,10 @@ Now you can configure the Integration, you can do this also after it's installed
 - Theme path: Make sure this is set to the same path as is configured in your `configuration.yaml` (default: `/themes`)
 - Include Custom Cards: This will make sure almost all dependency cards are included and configured for you.
 
+!!! danger ""
+
+    Activate **"Include Custom Cards"** only if you have not already installed the required Lovelace resources yourself, or if you dont want to install them by yourself. Otherwise this can currently lead to a freeze of the frontend due to double loaded lovelace resources.
+
 | Included lovelace resources                                             |
 |-------------------------------------------------------------------------|
 | [`button-card`](https://github.com/custom-cards/button-card)            |