Merge branch 'fix-link' into 'develop'

add secondary link

See merge request R3/howto-cards!217

.ci/generateIndex.py

@@ -197,6 +197,7 @@ for s in sections:
 index += "\n</div>"
 
 ## add link to return to main index
+index += "<br><center><a href='/'>go back</a></center>"
 index += "<br><center><a href='/cards'>Overview of all HowTo cards</a></center>"
 
 # output the index