releaser: Add release notes to /docs for release of 0.84.1

[ci skip]

Author: bep

docs/content/en/news/0.84.1-relnotes/index.md

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+---
+date: 2021-06-24
+title: "Hugo 0.84.1: A couple of Bug Fixes"
+description: "This version fixes a couple of bugs introduced in 0.84.0."
+categories: ["Releases"]
+images:
+- images/blog/hugo-bug-poster.png
+
+---
+
+	
+
+This is a bug-fix release with a couple of important fixes.
+
+* Fix language menu config regression [093dacab](https://github.com/gohugoio/hugo/commit/093dacab29a3c6fc363408453d0bc3b1fc159ad5) [@bep](https://github.com/bep) [#8672](https://github.com/gohugoio/hugo/issues/8672)
+* config: Fix merge of config with map[string]string values. [4a9d408f](https://github.com/gohugoio/hugo/commit/4a9d408fe0bbf4c563546e35d2be7ade4e920c4c) [@bep](https://github.com/bep) [#8679](https://github.com/gohugoio/hugo/issues/8679)
+* markup: Rename Header(s) to Heading(s) in ToC struct [a7e3da24](https://github.com/gohugoio/hugo/commit/a7e3da242f98d4799dad013d7ba2f285717640d6) [@bep](https://github.com/bep) 
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+
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