fix: accept direct icon URLs

Use valid direct HTTP(S) icon URLs without repository search.

apps/docs/docs/advanced/icons/index.mdx

@@ -31,4 +31,4 @@ Icons that are high quality and printable ([SVG](https://wikipedia.org/wiki/Scal
 
 ### Using external icons
 If you don't find the icon you're looking for on Dashboard Icons or wish to use a different source, you can simply enter a URL that points to an icon.
-It is important that the URL directly points to the file without any advertisements or elements around it.
+Direct HTTP(S) image URLs are used as entered instead of being searched in the built-in repositories. It is important that the URL directly points to the file without any advertisements or elements around it.

apps/docs/docs/management/apps/index.mdx

@@ -28,7 +28,7 @@ The name must be at least one character long and can be chosen freely.
 ### Icon URL
 
 This is the URL to the icon that will be displayed on the app widget. 
-It can be a url to an image in the internet, one from the included icon repositories or a local file uploaded through the upload button.
+You can paste a direct HTTP(S) URL to an image, search the included icon repositories by name, or upload a local file through the upload button. Direct image URLs are used as entered and are not searched in the icon repositories.
 
 ![Icon URL](./img/app-icon-url.png)
 
@@ -50,4 +50,4 @@ It's useful when you want to ping the service internally for example with a cust
 
 On the apps management page you find all apps that exist in your Homarr instance. You can edit and delete them.
 
-![Apps list](./img/app-list.png)
+![Apps list](./img/app-list.png)