Guides section should show in the headline if a guide is already written
Looking at
https://developer.puri.sm/Librem5/Apps/Guides/index.html
it's a bit frustrating when clicking on the link to find no content. I guess it's fine if the content is not there yet but it would be nice if the headline would indicate that (like by adding a small "TODO" image). We could for new guides later on add "New" images for peopel to make it easy to discover new content.