Make annotations more discoverable

Annotations are a great feature, but they are hardly discoverable for anyone not familiar with XWiki. In our case, all of our users are used to Google docs, where commenting on a portion of text is trivial: you just need to select some text and immediately a popup shows up suggesting to add a comment (or a suggestion).

Similarly, we're benchmarking XWiki against HackMD, which as a similar feature: just select rendered text and a popup shows up to add a comment:

 

It would be great if XWiki provided a similar UX: it's currently very hard to figure out that you have to open the "..." menu on a page, or select text and press CTLR+M to annotate a portion of text.