[DOCS-1709] Start publishing SDK release notes (#1854)

## Description
[DOCS-1709] Start publishing SDK release notes

- Pulled content from wandb/wandb releases
- Converted to Mintlify `<Update>`s
- Adjust release notes landing page and nav

Author: mdlinville

docs.json

@@ -1112,8 +1112,19 @@
             "icon": "/icons/cropped-reports.svg",
             "pages": [
               "release-notes",
-              "release-notes/server-releases",
-              "release-notes/server-releases-archived",
+              {
+                "group": "W&B Server",
+                "pages": [
+                  "release-notes/server-releases",
+                  "release-notes/server-releases-archived"
+                ]
+              },
+              {
+                "group": "W&B SDK",
+                "pages": [
+                  "release-notes/sdk-releases"
+                ]
+              },
               "release-notes/release-policies"
             ]
           },

release-notes.mdx

@@ -3,20 +3,24 @@ title: Release Notes
 mode: wide
 ---
 
-We have two channels for release notes, each with their own RSS feeds.
+This section includes release notes for W&B Server and W&B SDK.
 
 <Columns cols={2}>
-<Card 
-  title="Release notes for supported W&B Server releases" 
-  href="./release-notes/server-releases"
+<Card
+  title="W&B Server"
   icon="rss"
-/>
+  href="/release-notes/server-releases"
+>
+  - [Supported releases](/release-notes/server-releases)
+  - [Archived releases](/release-notes/server-releases-archived)
+</Card>
 
 <Card 
-  title="Historical release notes for archived W&B Server releases" 
-  href="./release-notes/server-releases-archived"
-  icon="rss"
-/>
+  title="W&B SDK" 
+  href="./release-notes/sdk-releases"
+  icon="rss">
+  - [All releases](/release-notes/sdk-releases)
+</Card>
 </Columns>
 
-In addition, you can view [details about Weights & Biases' release policies](./release-notes/release-policies).
+<Tip>Learn about [W&B releases policies and processes](./release-notes/release-policies).</Tip>