doc: Clean out release notes post-0.18.0
Tree-SHA512: c1076f844d7b083e1637aeed51b05a638b8d8068a58cf1f24be9af811c071d11d71552d1b1ebfc7ba14a53aa2534288d12039c1a00270a316d528244144a74ad
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Tree-SHA512: c1076f844d7b083e1637aeed51b05a638b8d8068a58cf1f24be9af811c071d11d71552d1b1ebfc7ba14a53aa2534288d12039c1a00270a316d528244144a74ad