docs: add image preview for index page (#7920)

## Description of changes

try adding twitter-card preview image per
https://quarto.org/docs/websites/website-tools.html#preview-images

## Issues closed

docs/_quarto.yml

@@ -33,6 +33,10 @@ website:
   site-url: https://ibis-project.org
   description: "the portable Python dataframe library"
   favicon: logo.svg
+  open-graph:
+    image: logo.png
+  twitter-card:
+    image: logo.png
 
   # search
   search:
@@ -41,7 +45,6 @@ website:
 
   # options
   reader-mode: false
-  twitter-card: true
   back-to-top-navigation: true
   repo-url: https://github.com/ibis-project/ibis
   repo-actions: [edit, issue]

docs/index.qmd

@@ -3,6 +3,8 @@ title: "Ibis"
 description: "the portable Python dataframe library"
 repo-actions: false
 code-annotations: hover
+twitter-card:
+  image: logo.png
 format:
   html:
     toc: false