Further fix Tutorials page naming

- Use the extended name in the visible page title. The SEO metadata
  field automatically detects and matches this, so we don't need to
  have a separate instance of the long title that can get out of sync
  in the frontmatter.
- Use the short name (Tutorials) in the top nav. (The previous commit
  changed the sidebar to use the short name.)

docs/tutorials/index.md

@@ -1,9 +1,8 @@
 ---
 seo:
-    title: Crypto Wallet and Blockchain Development Tutorials
     description: Learn how to get started building on the XRP Ledger with these helpful crypto wallet and blockchain tutorials for developers.
 ---
-# Tutorials
+# Crypto Wallet and Blockchain Development Tutorials
 
 The XRP Ledger tutorials walk you through the steps to learn and get started with the XRP Ledger and to use the ledger for advanced use cases.
 
@@ -39,4 +38,4 @@ These examples provide step-by-step instructions for administrative tasks.
 {% xrpl-card title="Use XRPL Sidechains" body="Bridge XRP and tokens from Mainnet to XRPL sidechains." href="/docs/tutorials/how-tos/use-xrpl-sidechains/" /%}
 
 
-{% /card-grid %}
+{% /card-grid %}