Allow linking comments to blocks

[samueldurantes]

Currently, the page's comments are not linked to blocks. In this situation, it is difficult to understand the context of these comments.

For example, if my page has 30 blocks, I don’t know which block John is referring to.

The solution to this problem would be to allow users to link a comment to a block. This way, it would be easier for other users to understand the context of the comments.