docs: standardize opBNB quickstart slug (#1200)

* docs: standardize opBNB quickstart slug to match other chains

Rename slug from opbnb-chain-api-quickstart to opbnb-api-quickstart
to match the standard pattern used by other chains. Add redirect from
the old slug. Update all internal references.

* docs: move redirect from frontmatter to redirects.yml

Author: SahilAujla

content/api-reference/node-api/node-supported-chains.mdx

@@ -158,7 +158,7 @@ Alchemy supports both EVM and non-EVM chains, view API references below:
     View Gnosis API reference.
   </Card>
 
-  <Card title="opBNB" icon={<img src="https://alchemyapi-res.cloudinary.com/image/upload/v1764180067/docs/api-reference/node-api/opbnb.svg" alt="opBNB logo"/>} href="/docs/reference/opbnb-chain-api-quickstart">
+  <Card title="opBNB" icon={<img src="https://alchemyapi-res.cloudinary.com/image/upload/v1764180067/docs/api-reference/node-api/opbnb.svg" alt="opBNB logo"/>} href="/docs/reference/opbnb-api-quickstart">
     View opBNB API reference.
   </Card>
 

content/api-reference/opbnb-paid-tier/opbnb-chain-api-faq.mdx

@@ -19,7 +19,7 @@ No, opBNB is only available on paid tiers (pay as you go, enterprise). If you're
 
 ## How can I get started using the opBNB API?
 
-Explained in [opBNB API Quickstart](/docs/reference/opbnb-chain-api-quickstart).
+Explained in [opBNB API Quickstart](/docs/reference/opbnb-api-quickstart).
 
 ## Is opBNB EVM compatible?
 

content/api-reference/opbnb-paid-tier/opbnb-chain-api-quickstart.mdx

@@ -2,7 +2,7 @@
 title: opBNB Chain API Quickstart
 description: How to get started building on opBNB using Alchemy
 subtitle: How to get started building on opBNB using Alchemy
-slug: reference/opbnb-chain-api-quickstart
+slug: reference/opbnb-api-quickstart
 ---
 
 <Tip title="Don't have an API key?" icon="star">

content/api-reference/opbnb/opbnb-api-overview.mdx

@@ -7,7 +7,7 @@ slug: docs/opbnb/opbnb-api-overview
 
 ## opBNB APIs
 
-📙 Get started with our [opBNB API Quickstart Guide](/docs/reference/opbnb-chain-api-quickstart).
+📙 Get started with our [opBNB API Quickstart Guide](/docs/reference/opbnb-api-quickstart).
 
 |                                                                                                 |                                                                                             |
 | ----------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------- |

content/redirects.yml

@@ -1,4 +1,8 @@
 redirects:
+  - source: /docs/reference/opbnb-chain-api-quickstart
+    destination: /docs/reference/opbnb-api-quickstart
+    permanent: true
+
   - source: /docs/wallets/recipes/social-payments-and-defi
     destination: /docs
     permanent: true