style(index): simplify alt text

Author: amyheather

index.qmd

@@ -1,7 +1,7 @@
 **Share your research openly with a simple website**
 
 ::: {.img-float}
-![](images/daffodil.png){alt="A yellow daffodil flower with a long green stem, because I thought the page looked boring otherwise" style="float: right; margin: 20px; width: 20%;"}
+![](images/daffodil.png){alt="Daffodil illustration" style="float: right; margin: 20px; width: 20%;"}
 :::
 
 In this hands-on workshop, you'll learn how to build a straightforward Quarto website to share and organise your research. You will be introduced to using GitHub, Quarto and Markdown. No prior experience is needed - we'll guide you through each step using free, open tools that make it quick and straightforward to get a site online.
@@ -37,4 +37,4 @@ After the workshop, you can keep building on your site. Quarto has many possibil
 
 This course was developed as part of the [STARS project](https://pythonhealthdatascience.github.io/stars/). STARS is supported by the Medical Research Council [grant number MR/Z503915/1].
 
-![](images/stars_reproduce_reuse_banner_blue.png)
+![](images/stars_reproduce_reuse_banner_blue.png){fig-alt="Sharing Tools and Artefacts for Reproducible & Reusable Simulations in healthcare"}