docs: document 1.0.0 migration

blog/2024/09-23-version-1.0/index.mdx

@@ -13,6 +13,8 @@ This will be a one time occurrence and version > ``1.0`` will have less breaking
 This time more important than every; **read the breaking changes** list and **create a backup** before updating.
 Some third party installation methods may take multiple days or weeks to update to the new version.
 
+See [this guide on how to import your previous Homarr dashboard](/docs/getting-started/after-the-installation#importing-a-zip-from-version-before-100)
+
 ## Changes at a glance
 - **Asynchronous integrations system**: In versions prior to ``1.0``, we fetched data upon each request synchronously.
 This means that the user had to wait for the requests to finish so any data would appear.

docs/getting-started/after-the-installation.mdx

@@ -14,6 +14,10 @@ import manageBoardHeaderEditMode from "./img/manage-board-header-edit-mode.png";
 import manageBoardHeaderAddItem from "./img/manage-board-header-add-item-menu.png";
 import manageBoardHeaderChooseItem from "./img/manage-board-header-choose-item.png";
 import manageBoardNoApp from "./img/manage-board-no-app.png";
+import manageExportOldHomarr from "./img/old-homarr-export-data.png";
+import manageImportOldHomarrDropzone from "./img/old-homarr-import-dropzone.png";
+import manageImportOldHomarrChooseData from "./img/old-homarr-import-choose-imported-data.png";
+import manageImportDecryptionToken from "./img/old-homarr-import-decryption-token.png";
 
 :::tip
 
@@ -73,7 +77,19 @@ We recommend you to continue with the section [creating your first board on this
 This is recommended when you used Homarr before and want to re-import your data.
 It is important that you first migrate correctly using [the list of breaking changes for 1.0](/blog/2024/09/23/version-1.0).
 
-// TODO: Meierschlumpf
+<img src={manageExportOldHomarr} alt="Export from old Homarr" style={{ maxWidth: 500 }} />
+
+**How to export and import data**
+1. Navigate to your old Homarr, open your management pages, open the tools submenu and open ``Migrate to 1.0``.
+2. Check the contents that you want to export. We recommend you to export all data.
+3. Click on the export data button
+4. Save the ZIP file, that is being downloaded, on your device. If you selected "integrations" or "users", you also get an encryption / decryption key.
+Copy it and do not loose it!
+5. Go to your new >1.0.0 Homarr instance and start the onboarding. Choose ``Import from Homarr before 1.0``
+6. Drag and drop your previously downloaded ZIP archive into the file upload: <br/><img src={manageImportOldHomarrDropzone} style={{ maxWidth: 500 }} />
+7. Next, choose the data that you want to import and how to import it. Since screen sizes were removed in 1.0, we create a new board for every screen size by default. We recommend you to only keep the best layout and adjust it later in 1.0.0 - but you can also import all of them and pick later.<br/><img src={manageImportOldHomarrChooseData} style={{ maxWidth: 500 }} />
+8. If you previously exported integrations or users, you will be asked to decrypt the data safely using your obtained encryption token. Paste into the modal and confirm your action.<br/><img src={manageImportDecryptionToken} style={{ maxWidth: 500 }} />
+9. Next, you can [follow the same setup as when starting from scratch](#starting-from-scratch). After you completed the onboarding, all of your data will be migrated and available.
 
 ## Creating your first board
 In Homarr, you organize your apps and widgets on boards.