Blog post, changelog and docs for 1.19 (#6787)

changelog_unreleased/TEMPLATE.md

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+<!--
+
+1. Choose a folder based on which language your PR is for.
+
+   - For JavaScript, choose `javascript/` etc.
+   - For TypeScript specific syntax, choose `typescript/`.
+   - If your PR applies to multiple languages, such as TypeScript/Flow, choose one folder and mention which languages it applies to.
+
+2. In your chosen folder, create a file with your PR number: `pr-XXXX.md`. For example: `typescript/pr-6728.md`.
+
+3. Copy the content below and paste it in your new file.
+
+4. Fill in a title, the PR number and your user name.
+
+5. Optionally write a description. Many times it’s enough with just sample code.
+
+6. Change ```jsx to your language. For example, ```yaml.
+
+7. Change the `// Input` and `// Prettier` comments to the comment syntax of your language. For example, `# Input`.
+
+8. Choose some nice input example code. Paste it along with the output before and after your PR.
+
+-->
+
+#### Title ([#XXXX](https://github.com/prettier/prettier/pull/XXXX) by [@user](https://github.com/user))
+
+Optional description if it makes sense.
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+(foo ?? baz) || baz;
+
+// Prettier stable
+foo ?? baz || baz;
+
+// Prettier master
+(foo ?? baz) || baz;
+```