docs: add documentation for wrangler pages deployment delete command

[petebacondarwin]

Summary

Documents the new wrangler pages deployment delete CLI command being added in cloudflare/workers-sdk#12474. Changes across three Pages docs pages:

• preview-deployments.mdx: Adds a new "Delete preview deployments" section with CLI usage and --force flag.
• api.mdx: Adds a note callout in the "Deleting old deployments after a week" section pointing to the CLI alternative.
• known-issues.mdx: Replaces the old zip-file-based bulk deletion workaround with the new wrangler pages deployment delete command.

⚠️ Items for reviewer attention

1. Anchor link /workers/wrangler/commands/#deployment-delete — The Wrangler commands page auto-generates from the installed wrangler package via WranglerNamespace. This anchor won't resolve until the wrangler dependency in this repo is bumped to include the new command. Confirm this is acceptable to merge ahead of the version bump, or if it should be held.
2. known-issues.mdx: removal of bulk deletion script — The old workaround included a downloadable script that could delete all deployments at once (with options for aliased deployments). The replacement only documents deleting one deployment at a time. For users with 100+ deployments, this is more tedious. Consider whether the old instructions should be retained alongside the new CLI command.

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Link to Devin run | Requested by @petebacondarwin

Documentation checklist

• Is there a changelog entry (guidelines)?
• The change adheres to the documentation style guide.

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/pages/	@cloudflare/workers-docs, @GregBrimble, @WalshyDev, @aninibread, @irvinebroque, @cloudflare/pcx-technical-writing, @cloudflare/product-owners

[github-actions]

Preview URL: https://77419dd1.preview.developers.cloudflare.com
Preview Branch URL: https://devin-1770624774-pages-deployment-delete-docs.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/pages/platform/known-issues/	https://devin-1770624774-pages-deployment-delete-docs.preview.developers.cloudflare.com/pages/platform/known-issues/
https://developers.cloudflare.com/pages/configuration/preview-deployments/	https://devin-1770624774-pages-deployment-delete-docs.preview.developers.cloudflare.com/pages/configuration/preview-deployments/
https://developers.cloudflare.com/pages/configuration/api/	https://devin-1770624774-pages-deployment-delete-docs.preview.developers.cloudflare.com/pages/configuration/api/

[github-actions]

Hey there, we've marked this pull request as stale because there's no recent activity on it. This label is helps us identify PRs that might need updates (or to be closed out by our team if no longer relevant).

[github-actions]

Hey there, we've closed out this pull request because it's been stale for a while and there's been no additional action on it. If these changes are still relevant, open a new pull request (or flag to us in a GitHub issue).

[github-actions]

Hey there, we've marked this pull request as stale because there's no recent activity on it. This label helps us identify PRs that might need updates (or to be closed out by our team if no longer relevant).

[devin-ai-integration]

✅ Devin Review: No Issues Found

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View in Devin Review to see 2 additional findings.