Airbyte 2.0 release notes (#67003)

## What
<!--
* Describe what the change is solving. Link all GitHub issues related to
this change.
-->

Release notes for Airbyte 2.0.

Also:

- Added new terminology to linting allowlist for Vale.
- Added a React component so we can embed YouTube videos.

## How
<!--
* Describe how code changes achieve the solution.
-->

## Review guide
<!--
1. `x.py`
2. `y.py`
-->

## User Impact
<!--
* What is the end result perceived by the user?
* If there are negative side effects, please list them. 
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## Can this PR be safely reverted and rolled back?
<!--
* If unsure, leave it blank.
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- [x] YES 💚
- [ ] NO ❌

docusaurus/sidebar-release_notes.js

@@ -9,6 +9,7 @@ export default {
         id: "readme",
       },
       items: [
+        "v-2.0",
         "v-1.8",
         "v-1.7",
         "v-1.6",

docusaurus/src/components/YouTube.js

@@ -0,0 +1,23 @@
+import React from "react";
+
+export default function YouTube({ id }) {
+  return (
+    <div style={{ marginBottom: "2rem" }}>
+        <div style={{ position: "relative", paddingBottom: "56.25%", height: 0 }}>
+        <iframe
+            src={`https://www.youtube.com/embed/${id}`}
+            style={{
+            position: "absolute",
+            top: 0,
+            left: 0,
+            width: "100%",
+            height: "100%",
+            }}
+            allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
+            allowFullScreen
+            title="YouTube video"
+        />
+        </div>
+    </div>
+  );
+}