[DASH-642] Add opengraph image + meta for chainlist (#5771)

## Problem solved

Short description of the bug fixed or feature added

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## PR-Codex overview
This PR focuses on updating the `metadata` object in the `page.tsx` file for the `ChainListPage` component, specifically modifying the `title` and `description` properties for improved clarity and consistency.

### Detailed summary
- Added a new `title` variable with the value "Chainlist: RPCs, Block Explorers, Faucets".
- Added a new `description` variable with the updated description text.
- Updated the `metadata` object to use the new `title` and `description` variables.
- Introduced an `openGraph` property in the `metadata` object that includes the new `title` and `description`.

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Author: MananTank

apps/dashboard/src/app/(dashboard)/(chain)/chainlist/opengraph-image.png

@@ -11,10 +11,17 @@ import { ChainListView } from "./components/client/view";
 import { AddYourChainButton } from "./components/server/add-chain-button";
 import { ChainsData, type SearchParams } from "./components/server/chain-table";
 
+const title = "Chainlist: RPCs, Block Explorers, Faucets";
+const description =
+  "A list of EVM networks with RPCs, smart contracts, block explorers & faucets. Deploy smart contracts to all EVM chains with thirdweb.";
+
 export const metadata: Metadata = {
-  title: "Chainlist: RPCs, Block Explorers, Faucets",
-  description:
-    "A list of EVM networks with RPCs, smart contracts, block explorers & faucets. Deploy smart contracts to all EVM chains with thirdweb.",
+  title,
+  description,
+  openGraph: {
+    title,
+    description,
+  },
 };
 
 export default async function ChainListPage(props: {