Update charts-release.yaml

Signed-off-by: Kjeld Schouten <kjeld@schouten-lebbing.nl>

.github/workflows/charts-release.yaml

@@ -244,7 +244,9 @@ jobs:
                     title=$(cat "${file}" | grep "title: " | sed 's/title: //' | head -n 1)
                     echo "The title is: ${title}"
                     # Create a markdown link using the file name and title
-                    link="[**${title}**](./${filename})"
+                    filenameURL=${filename##*.}
+                    filenameURL=${filenameURL,,}
+                    link="[**${title}**](./${filenameURL})"
                     echo "The link is: ${link}"
                     if [ ${filename} != "index.md" ]; then
                       # Append the link to the index.md file