Add deploy guides links to integrations READMEs (#4612)

packages/integrations/cloudflare/README.md

@@ -2,6 +2,8 @@
 
 An SSR adapter for use with Cloudflare Pages Functions targets. Write your code in Astro/Javascript and deploy to Cloudflare Pages.
 
+Learn how to deploy your Astro site in our [Cloudflare Pages deployment guide](https://docs.astro.build/en/guides/deploy/cloudflare/).
+
 In your `astro.config.mjs` use:
 
 ```js

packages/integrations/deno/README.md

@@ -2,6 +2,8 @@
 
 This adapter allows Astro to deploy your SSR site to Deno targets.
 
+Learn how to deploy your Astro site in our [Deno Deploy deployment guide](https://docs.astro.build/en/guides/deploy/deno/).
+
 - <strong>[Why Astro Deno](#why-astro-deno)</strong>
 - <strong>[Installation](#installation)</strong>
 - <strong>[Usage](#usage)</strong>

packages/integrations/netlify/README.md

@@ -2,6 +2,8 @@
 
 This adapter allows Astro to deploy your SSR site to [Netlify](https://www.netlify.com/).
 
+Learn how to deploy your Astro site in our [Netlify deployment guide](https://docs.astro.build/en/guides/deploy/netlify/).
+
 - <strong>[Why Astro Netlify](#why-astro-netlify)</strong>
 - <strong>[Installation](#installation)</strong>
 - <strong>[Usage](#usage)</strong>

packages/integrations/vercel/README.md

@@ -2,6 +2,8 @@
 
 This adapter allows Astro to deploy your SSR site to [Vercel](https://www.vercel.com/).
 
+Learn how to deploy your Astro site in our [Vercel deployment guide](https://docs.astro.build/en/guides/deploy/vercel/).
+
 - <strong>[Why Astro Vercel](#why-astro-vercel)</strong>
 - <strong>[Installation](#installation)</strong>
 - <strong>[Usage](#usage)</strong>