Stage VSC 1.22 blog and model updates for pricing

[iskyOS]

• Adds blog file for the VS Code release post
• Updates pricing page for Cody Pro to include Gemini 1.5 Flash and Pro

[netlify[bot]]

✅ Deploy Preview for sourcegraph ready!

Name	Link
🔨 Latest commit	9bf48bd540703fc3e220e926a844c501549cf803
🔍 Latest deploy log	https://app.netlify.com/sites/sourcegraph/deploys/666a0583ed5ed900080abb67
😎 Deploy Preview	https://deploy-preview-7001--sourcegraph.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.