Update annotate-in-excel.mdx

src/content/docs/guides/annotate-in-excel.mdx

@@ -49,7 +49,7 @@ Currently, we recommend the installation using the [excel-browser version provid
 
 <Steps>
 
-1. Follow the installation guide for [Excel-Add-Ins](https://support.microsoft.com/en-us/office/add-or-remove-add-ins-in-excel-0af570c4-5cf3-4fa9-9b88-403625a0b460).
+1. Follow the Microsoft official documentation for sideloading add ins [Excel-Add-Ins](https://learn.microsoft.com/en-us/office/dev/add-ins/testing/test-debug-office-add-ins#sideload-an-office-add-in-for-testing).
 2. When the installation was successful, the icon of [Swate](https://nfdi4plants.github.io/nfdi4plants.knowledgebase/swate/), the Excel-Add-In for annotating data, should be available in the data tab.
 3. When you click on the icon the sidebar of swate should appear. Its size is adaptable and when it is big enough, the quick icons of the navbar are visible.
 4. When everything was successful, it should look similar to this: