[D1] Cross-referencing example of exporting D1 into R2 via REST API (#20062)

* Linking Backup and save D1 database into D1 docs.

* Adding the example into the Example sidebar from D1.

* Tweaking example link wording.

* Renaming title of the example.

* Fixing title.

* Finalising wording.

Author: Oxyjun

src/content/docs/d1/examples/export-d1-into-r2.mdx

@@ -0,0 +1,7 @@
+---
+pcx_content_type: navigation
+title: Export and save D1 database
+external_link: /workflows/examples/backup-d1/
+sidebar:
+  order: 1
+---

src/content/docs/d1/reference/time-travel.mdx

@@ -117,6 +117,12 @@ wrangler d1 time-travel info YOUR_DATABASE
  `wrangler d1 time-travel restore YOUR_DATABASE --bookmark=00000085-0000024c-00004c6d-8e61117bf38d7adb71b934ebbf891683`
 ```
 
+## Export D1 into R2 using Workflows
+
+You can automatically export your D1 database into R2 storage via REST API and Cloudflare Workflows. This may be useful if you wish to store a state of your D1 database for longer than 30 days.
+
+Refer to the guide [Export and save D1 database](/workflows/examples/backup-d1/).
+
 ## Notes
 
 - You can quickly get the Unix timestamp from the command-line in macOS and Windows via `date %+s`.

src/content/docs/workflows/examples/backup-d1.mdx

@@ -1,14 +1,14 @@
 ---
 type: example
-summary: Backup D1 using export API and save it on R2
+summary: Export a D1 database into R2 storage with Workflows
 tags:
   - Workflows
   - D1
   - R2
 languages:
   - Typescript
 pcx_content_type: configuration
-title: Backup and save D1 database
+title: Export and save D1 database
 sidebar:
   order: 3
 description: Send invoice when shopping cart is checked out and paid for