noosfero | Improve usability to add blocks in Noosfero (#305)

[Bráulio Bhavamitra]

New comment for Merge Request 305

https://gitlab.com/noosfero/noosfero/merge_requests/305#note_1995930


Bráulio Bhavamitra

@vfcosta the same for css, `content_for :head` should be used instead.

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