docs: remove stale blog routes from ws-resources.manual.json (#3525)

Remove stale blog routes from ws-resources.manual.json

The blog is not built by Docusaurus (no blog plugin configured), so the
8 blog HTML routes in ws-resources.manual.json pointed to non-existent
files, causing check-routes.sh to fail.

Remove the stale routes and also fix the broken /blog/04_testnet_update
link in operations.mdx (replace with docs-internal link).

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jessiemongeon1

docs/site/ws-resources.manual.json

@@ -16,14 +16,6 @@
   },
   "routes": {
     "/404": "/404.html",
-    "/blog": "/blog.html",
-    "/blog/01_announcing_walrus": "/blog/01_announcing_walrus.html",
-    "/blog/02_devnet_update": "/blog/02_devnet_update.html",
-    "/blog/03_whitepaper": "/blog/03_whitepaper.html",
-    "/blog/04_testnet_update": "/blog/04_testnet_update.html",
-    "/blog/05_testnet_redeployment": "/blog/05_testnet_redeployment.html",
-    "/blog/06_mainnet": "/blog/06_mainnet.html",
-    "/blog/archive": "/blog/archive.html",
     "/docs/data-security.md": "/markdown/data-security.md",
     "/docs/design/architecture.md": "/markdown/system-overview/core-concepts.md",
     "/docs/design/encoding.md": "/markdown/system-overview/core-concepts.md",