Removes outdated PostHog documentation sections

Cleans up the documentation by removing irrelevant Next Steps
related to PostHog instrumentation. This improves clarity
for users by eliminating confusion over previously suggested
steps no longer applicable.

Updates content to streamline the user experience in the
Astro and Next.js documentation sources.

Author: AbdallahAHO

src/astro/docs.ts

@@ -99,13 +99,5 @@ import PostHogLayout from '../layouts/PostHogLayout.astro';
   <h1>Welcome to Astro</h1>
 </PostHogLayout>
 --------------------------------------------------
-
-==============================
-NEXT STEPS
-==============================
-- Call \`posthog.identify()\` after user sign-in.
-- Fire custom events with \`posthog.capture()\`.
-- Gate features via \`posthog.isFeatureEnabled()\`.
-- Enable session recordings and heatmaps under “Recordings” in PostHog.
 `;
 }

src/nextjs/docs.ts

@@ -246,7 +246,7 @@ export const getModernNextjsDocs = ({
 }) => {
   return `
 ==============================
-FILE: instrumentation-client.${language === 'typescript' ? 'ts' : 'js'} 
+FILE: instrumentation-client.${language === 'typescript' ? 'ts' : 'js'}
 LOCATION: in the root of the application or inside an src folder.
 ==============================
 Changes: