0.21.0

[wwsalmon]

PS-38 Public snippet setting
PS-205 Make linked snippets on post page card format // just redo the whole thing
PS-207 make private project pages easier to go to, i.e. /projects/scratch rather than /[id]
PS-208 Add back to private project button from public project
PS-212 Add explainer text for snippets under posts
PS-214 * Public snippet page
PS-215 * Show public snippets on project page
PS-217 * Filter for public snippets in project snippet tab
PS-219 * Show public snippets on profile page
PS-220 * show project on snippet card on profile page
PS-221 * Fix post preview uri encoding (bug)
PS-222 * URL for snippet tab on project page
PS-223 * Make all projects easier to get to
PS-224 * Fix PostFeedItem error in project page

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