Update Blog policy

[Mark-Simulacrum]

cc rust-lang/blog.rust-lang.org#1013, rust-lang/leadership-council#173

Rendered

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[ehuss]

Thanks! I'm going to go ahead and merge since this aligns with my understanding of what we decided last week.

I might also suggest linking this page from somewhere like https://github.com/rust-lang/blog.rust-lang.org/blob/master/README.md#contributing

[Mark-Simulacrum]

Yeah, I plan for some further updates, this is just step 1.