Framework guide create commands shouldn't have `--framework=pages` flag

[johtso]

Example URL(s)

https://developers.cloudflare.com/pages/framework-guides/deploy-an-astro-site/

Actual Behavior

If workers are now the recommendation for new projects, the framework guides shouldn't provide the pages flag by default

Expected Behavior

The framework guides would provide a command that deploys to workers by default

Additional information

No response

[kodster28]

This is a page within the Pages section, so it does still make sense to include the --framework=pages within this context.

We have a separate page on https://developers.cloudflare.com/workers/framework-guides/web-apps/astro/ has more guidance for Workers here.