feat: document experimental static headers

src/content/docs/en/guides/integrations-guide/netlify.mdx

@@ -327,6 +327,32 @@ export default defineConfig({
 });
 ```
 
+#### `experimentalStaticHeaders`
+
+<p>
+  **Type:** `boolean` <br />
+</p>
+
+If enabled, the adapter will save [static headers in the framework API file](https://docs.netlify.com/frameworks-api/#headers).
+
+Here is the list of the headers that are added:
+- The CSP header of the static pages is added when CSP support is enabled.
+
+```js title="astro.config.mjs" {6}
+import { defineConfig } from 'astro/config';
+import netlify from '@astrojs/netlify';
+
+export default defineConfig({
+  experimental: {
+    cps: true
+  },
+  adapter: netlify({
+    experimentalStaticHeaders: true 
+  })
+});
+```
+
+
 ## Examples
 
 * The [Astro Netlify Edge Starter](https://github.com/sarahetter/astro-netlify-edge-starter) provides an example and a guide in the README.

src/content/docs/en/guides/integrations-guide/node.mdx

@@ -106,6 +106,32 @@ export default defineConfig({
 });
 ```
 
+
+### `experimentalStaticHeaders`
+
+<p>
+  **Type:** `boolean` <br />
+</p>
+
+If enabled, the adapter will serve the headers of the static pages using the `Response` object. 
+
+Here is the list of the headers that are added:
+- The CSP header of the static pages is added when CSP support is enabled.
+
+```js title="astro.config.mjs" {6}
+import { defineConfig } from 'astro/config';
+import node from '@astrojs/node';
+
+export default defineConfig({
+  experimental: {
+    cps: true
+  },
+  adapter: node({
+    experimentalStaticHeaders: true 
+  })
+});
+```
+
 ## Usage
 
 First, [performing a build](/en/guides/deploy/#building-your-site-locally). Depending on which `mode` selected (see above) follow the appropriate steps below: