Adds Doctave to site generators

[begleynk]

Hi folks. Thanks for maintaining this list!

Do let me know if I missed anything here.

[netlify[bot]]

✔️ Deploy Preview for jamstack-site ready! Built without sensitive environment variables

🔨 Explore the source changes: 1e1cc694c044f9d6af6112c961da6407516751f7

🔍 Inspect the deploy log: https://app.netlify.com/sites/jamstack-site/deploys/6180e023e6fa4d000718d456

😎 Browse the preview: https://deploy-preview-674--jamstack-site.netlify.app