fix links again

- this time point some at GiottoClass since they are re-exported

_pkgdown.yml

@@ -21,6 +21,7 @@ template:
 
          gtag('config', 'G-2V1K0KPLJC');
        </script>
+       <link href="extra.css" type="text/css" rel="stylesheet">
   bootstrap: 3
   bslib:
     bg: "#FFFFFF"

vignettes/object_creation.Rmd

@@ -1,6 +1,6 @@
 ---
 title: "Giotto Object Creation"
-css: "../assets/custom.css"
+css: "../pkgdown/extra.css"
 output: 
   html_document:
     number_sections: false
@@ -144,11 +144,11 @@ createGiottoCosMxObject()
 By providing values to other `createGiottoObject()` or `createGiottoObjectSubcellular()` parameters, it is possible to add:
 
 - **Cell** or **feature (gene) metadata**: see
-    [addCellMetadata](../reference/addCellMetadata.html) and
-    [addFeatMetadata](../reference/addFeatMetadata.html)
+    [addCellMetadata](https://drieslab.github.io/GiottoClass/reference/addCellMetadata.html) and
+    [addFeatMetadata](https://drieslab.github.io/GiottoClass/reference/addFeatMetadata.html)
 - **Spatial networks** or **grids**: see [Visualizations](./visualizations.html)
 - **Dimension reduction**: see [Clustering](./dimension_reduction.html)
-- **Images**: see [createGiottoLargeImage](../reference/createGiottoLargeImage.html)
+- **Images**: see [createGiottoLargeImage](https://drieslab.github.io/GiottoClass/reference/createGiottoLargeImage.html)
 - **giottoInstructions**: see [Create and change Giotto instructions](instructions.html) 
 
 For a more in-depth look at the `giotto` object structure, take a look at the [introduction to giotto classes](structure.html)