news: beta 21 news for Grafast & PostGraphile

[jemgillam]

Description

@benjie here's a postgraphile.org article, please pay attention to the paragraph "What does this mean for PostGraphile?" and edit as appropriate. All the rest of the content already exists on graphile.org

Also adds some more Grafast specific things to the grafast.org article.

[changeset-bot]

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