Add a proposal space for Parca

[kakkoyun]

Add a page to list links to the Parca design documents or proposals

[brancz]

We have the public google drive already, what if we just document this?

[kakkoyun]

Yes, exactly this, actually. Maybe an automated mechanism to just list whatever we have in the public directory. I think we just need to make it more visible.

[brancz]

Works for me.