remove experimental flag from astro workers template (#20916)

Author: emily-shen

src/content/docs/workers/frameworks/framework-guides/astro.mdx

@@ -24,7 +24,7 @@ To use `create-cloudflare` to create a new Astro project with <InlineBadge prese
 <PackageManagers
 	type="create"
 	pkg="cloudflare@latest my-astro-app"
-	args={"--framework=astro --experimental"}
+	args={"--framework=astro --platform=workers"}
 />
 
 <Render

src/content/docs/workers/frameworks/framework-guides/remix.mdx

@@ -25,7 +25,7 @@ To use `create-cloudflare` to create a new Remix project with <InlineBadge prese
 <PackageManagers
 	type="create"
 	pkg="cloudflare@latest my-remix-app"
-	args={"--framework=remix --experimental"}
+	args={"--framework=remix --platform=workers"}
 />
 
 <Render

src/content/docs/workers/frameworks/framework-guides/svelte.mdx

@@ -24,7 +24,7 @@ To use `create-cloudflare` to create a new Svelte project with <InlineBadge pres
 <PackageManagers
 	type="create"
 	pkg="cloudflare@latest my-svelte-app"
-	args={"--framework=svelte --experimental"}
+	args={"--framework=svelte --platform=workers"}
 />
 
 <Render