added a deprecation flag to the wrangler init command

[mxschumacher]

Summary

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Documentation checklist

• [ ] The documentation style guide has been adhered to.
• [ ] If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• [ ] Files which have changed name or location have been allocated redirects.

[kodster28]

This still accurate given the convo we were having internally?

[KimJ15]

👋Hi there, we’re going to close this PR. All PRs prior to August 12 need to be reworked due to the platform migration to Astro.