Remove mentions of alpha version from Cairo docs

Author: immrsd

content/contracts-cairo/index.mdx

@@ -2,7 +2,7 @@
 title: Contracts for Cairo
 ---
 
-import { latestAlpha, latestStable } from "./latest-versions.js";
+import { latestStable } from "./latest-versions.js";
 
 **OpenZeppelin Contracts for Cairo** provides modular, reusable, and audited smart-contract building blocks for Starknet. The library ships with ready-to-use components, presets, utilities, and tooling that help you ship production-grade Cairo applications faster.
 
@@ -12,9 +12,6 @@ import { latestAlpha, latestStable } from "./latest-versions.js";
   <Card href={`/contracts-cairo/${latestStable}`} title={`Latest Stable (${latestStable})`}>
     Explore the stable and audited documentation set, including installation, components, and production-ready guides.
   </Card>
-  <Card href="/contracts-cairo/alpha" title={`Latest Alpha (${latestAlpha})`}>
-    Try the upcoming features, updated APIs, and experimental packages before they are audited, available in the alpha release track.
-  </Card>
   <Card href={`/contracts-cairo/${latestStable}/wizard`} title="Contracts Wizard">
     Bootstrap Cairo contracts with the interactive Wizard and learn how features compose across packages.
   </Card>

content/contracts-cairo/latest-versions.js

@@ -1,4 +1 @@
-import { UMBRELLA_VERSION as latestAlphaVersion } from "./alpha/utils/constants.js";
-
 export const latestStable = "3.x";
-export const latestAlpha = latestAlphaVersion;

src/components/banners/alpha-banner.tsx

@@ -1,9 +1,6 @@
 "use client";
 
-import {
-	latestAlpha,
-	latestStable,
-} from "content/contracts-cairo/latest-versions";
+import { latestStable } from "content/contracts-cairo/latest-versions";
 import { Callout } from "fumadocs-ui/components/callout";
 import Link from "next/link";
 import { usePathname } from "next/navigation";
@@ -40,7 +37,7 @@ export function AlphaBanner() {
 	return (
 		<Link href={stableUrl} className="hover:underline transition-all">
 			<Callout title="Alpha Version" type="warn">
-				You're viewing an unaudited alpha version <code>v{latestAlpha}</code>.
+				You're viewing an unaudited alpha version.
 				Click here to visit the latest stable release.
 			</Callout>
 		</Link>