[Docs Site] Add AvailableChangelogFeeds component

src/components/AvailableChangelogFeeds.astro

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+---
+import { Aside } from "@astrojs/starlight/components";
+
+import AnchorHeading from "./AnchorHeading.astro";
+import RSSButton from "./RSSButton.astro";
+import Details from "./Details.astro";
+
+import { getCollection } from "astro:content";
+import { getChangelogs } from "~/util/changelog";
+
+const changelogs = await getChangelogs({});
+const productsInChangelog = changelogs.flatMap((entry) =>
+	entry.data.products.map((product) => product.id),
+);
+
+const products = await getCollection("products", (entry) => {
+	return productsInChangelog.includes(entry.id);
+});
+
+const productsByGroup = Object.entries(
+	Object.groupBy(
+		products.filter((product) => Boolean(product.data.product.group)),
+		(product) => product.data.product.group,
+	),
+).sort();
+---
+
+<AnchorHeading depth={2} title="Feeds" />
+
+<AnchorHeading depth={3} title="Global feed" />
+<p>
+	This feed contains entries for all Cloudflare products in the changelog: <RSSButton
+		changelog="index"
+	/>
+</p>
+
+<AnchorHeading depth={3} title="Area-specific feeds" />
+
+<p>
+	Cloudflare also offers RSS feeds scoped to specific product areas or products
+	in the <a href="/changelog/">changelog</a>.
+</p>
+
+{
+	productsByGroup.map(([group, products]) => (
+		<>
+			<AnchorHeading depth={4} title={group} />
+			<p>
+				This feed is for all {group} products in the changelog:{" "}
+				<RSSButton changelog={group} />
+			</p>
+			<Details header="Included products">
+				<ul>
+					{products?.map((product) => (
+						<li>
+							<p>
+								<a href={product.data.product.url}>
+									{product.data.product.title}
+								</a>
+							</p>
+							<RSSButton changelog={product.id} />
+						</li>
+					))}
+				</ul>
+			</Details>
+			{group === "Application security" && (
+				<Aside type="note" title="DDoS and WAF ruleset feeds">
+					<p>
+						For <a href="/ddos-protection/">DDoS Protection</a> or{" "}
+						<a href="/waf/">WAF</a> updates to managed rulesets, please refer to
+						their independent feeds:
+						<ul>
+							<li>
+								<p>
+									<a href="/ddos-protection/change-log/network/">
+										Network-layer DDoS managed ruleset
+									</a>
+								</p>
+								<RSSButton href="/ddos-protection/change-log/network/index.xml" />
+							</li>
+							<li>
+								<p>
+									<a href="/ddos-protection/change-log/http/">
+										HTTP DDoS managed ruleset
+									</a>
+								</p>
+								<RSSButton href="/ddos-protection/change-log/http/index.xml" />
+							</li>
+							<li>
+								<p>
+									<a href="/waf/change-log/">WAF managed ruleset</a>
+								</p>
+								<RSSButton href="/waf/change-log/index.xml" />
+							</li>
+						</ul>
+					</p>
+				</Aside>
+			)}
+			{group === "Core platform" && (
+				<Aside type="note" title="API deprecations feed">
+					<p>
+						Cloudflare also maintains a separate{" "}
+						<a href="/fundamentals/api/reference/deprecations/">
+							API deprecations page.
+						</a>
+						<br />
+						<RSSButton href="/fundamentals/api/reference/deprecations/index.xml" />
+					</p>
+				</Aside>
+			)}
+		</>
+	))
+}

src/components/RSSButton.astro

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+---
+import { z } from "astro:schema";
+import { Icon } from "@astrojs/starlight/components";
+
+const props = z
+	.object({
+		changelog: z
+			.string()
+			.transform((val) => val.toLowerCase().replaceAll(" ", "-")),
+	})
+	.or(
+		z.object({
+			href: z.string(),
+		}),
+	);
+
+const input = props.parse(Astro.props);
+---
+
+<a
+	href={"href" in input ? input.href : `/changelog/rss/${input.changelog}.xml`}
+	class="inline-flex items-center justify-center gap-1 rounded font-semibold no-underline"
+	target="_blank"
+>
+	Subscribe to RSS
+	<Icon name="rss" size="1.25rem" />
+</a>

src/content/docs/fundamentals/new-features/available-rss-feeds.mdx

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+---
+title: Available RSS Feeds
+pcx_content_type: reference
+description: Read about the various RSS feeds available for Cloudflare's changelogs.
+---
+
+import AvailableChangelogFeeds from "~/components/AvailableChangelogFeeds.astro";
+
+Cloudflare offers various RSS feeds as part of our [changelog](/changelog/), which helps you stay up to date on new features and functionality.
+
+For more details on how these feeds are structured, refer to [Consuming RSS Feeds](/fundamentals/new-features/consuming-rss-feeds/).
+
+<AvailableChangelogFeeds />

src/content/docs/fundamentals/new-features/consuming-rss-feeds.mdx

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+---
+title: Consuming RSS Feeds
+pcx_content_type: reference
+description: Learn how to consume our changelog RSS feeds.
+---
+
+Our [changelogs](/changelog/) are published to [various RSS feeds](/fundamentals/new-features/available-rss-feeds/) with HTML in the `<description>` tag.
+
+In feeds with multiple products, such as the global or product-area feeds, the products associated with a given entry are in the `<category>` tag.
+
+A single product will also appear in the custom `<product>` tag for legacy reasons, but we recommend you use the `<category>`
+
+## Example XML
+
+```xml
+<rss version="2.0">
+	<channel>
+		<title>Cloudflare changelogs</title>
+		<description>Updates to various Cloudflare products</description>
+		<link>https://developers.cloudflare.com/changelog/</link>
+		<item>
+			<title>Agents, Workers, Workflows - Build AI Agents with Example Prompts</title>
+			<link>https://developers.cloudflare.com/changelog/2025-02-14-example-ai-prompts/</link>
+			<guid isPermaLink="true">https://developers.cloudflare.com/changelog/2025-02-14-example-ai-prompts/</guid>
+			<description>
+				<p>
+					We've added an <a href="https://developers.cloudflare.com/workers/get-started/prompting/">example prompt</a> to help you get started with building AI agents and applications on Cloudflare ...
+				</p>
+			</description>
+			<pubDate>Fri, 14 Feb 2025 19:00:00 GMT</pubDate>
+			<product>Agents</product>
+			<category>Agents</category>
+			<category>Workers</category>
+			<category>Workflows</category>
+		</item>
+	</channel>
+</rss>
+```

src/content/docs/fundamentals/new-features/index.mdx

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+---
+pcx_content_type: concept
+title: New features
+sidebar:
+  order: 5
+---
+
+At Cloudflare, we are constantly innovating and improving our products.
+
+The best way to stay up to date with this innovation is to read our [changelog](/changelog/).
+
+If you prefer to consume these updates in another format, we also offer [RSS feeds](/fundamentals/new-features/available-rss-feeds/).