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<blockquote>How do I encourage a community mindset ... not just viewed as "Sigma's project"</blockquote>

You don't.  This is your manager's job.  Talk to them.  Make some suggestions.  But in the end, this is their call, and not your job unless they explicitly make it your job.

You say management "fully supports and encourages" people writing documentation, but that's a long way from it being part of everyone's job.  When someone finishes a task and tells management, does management say <i>"Great, show me the documentation"</i>?  If there isn't any, is the answer <i>"Then you're not really done yet.  Come back when everything is finished, including the documentation"</i>?  If there is documentation, does somebody actually review it?

Until the answers to each of these questions is "Yes", management doesn't consider it important, and therefore neither will your co-workers.  Why should they?  It's not their job.  They have other tasks assigned to them that management <i>does</i> care about seeing done.

Also keep in mind that doing something and describing it are two different skills.  You may not like the mess of a result if the doers who are not good at writing are forced to write anyways.  Even worse, they may not like this change in their job description.  It's not what they signed up for, and possibly not what they want to spend their time doing.

So in summary, either management gets behind this for real and sees that it's done right, or it will never be what you want.  If the group is large enough, then it will require a dedicated writer to work with the team to document their processes.