[Wrangler] Update v1 tutorials to v2

[lrapoport-cf]

the following tutorials need updating to work with wrangler v2+:

• https://developers.cloudflare.com/workers/tutorials/github-sms-notifications-using-twilio/: this tutorial assumes type="webpack" with polyfills for the built-in node:crypto module and Buffer global
• https://developers.cloudflare.com/workers/tutorials/hello-world-rust/: points to https://github.com/cloudflare/rustwasm-worker-template/, which has been updated to use workers-rs, but the tutorial is still assuming type="rust" (i.e. worker/worker.js doesn't exist anymore)
• https://developers.cloudflare.com/workers/tutorials/build-a-qr-code-generator/: wrangler init now puts index.js in a src directory, and this uses type="webpack"
• https://developers.cloudflare.com/workers/tutorials/handle-form-submissions-with-airtable/: includes redundant type="javascript", and assumes outdated wrangler init output structure
• [Workers] Localize a website feedback #14414
• Build a slackbot --> Wrangler v1 #14415
• Build a JAMstack app wrangler 2 #14417
• Store data with Fauna --> Wrangler 1 to 2 #14418
• workers-kv-from-rust tutorial obsolete #12668
• Postgress tutorial #14419

Originally posted by @mrbbot in #6925 (comment)

[lauragift21]

I can take a look into this @lrapoport-cf and update the tutorials.

[LMallett8]

Yes

[kodster28]

Very belated, but we're closing this out as all tutorials as updated.

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