refactor: connector fragments used in generating tutorials

[charIeszhao]

Summary

Refactor onnector fragments for generating "Build X with Y" tutorials

1. Create a new docusaurus plugin to generate tutorials, as it would be needed when generating i18n locales.
2. Update connector guides in docs/integrations folder. Extract fragment for both connector guide and tutorial.
3. Update the SDK fragment used for generating tutorials.
4. Place the above connector fragments and SDK fragments in docs folder (previously in tutorial folder), so that they can be picked up by the translation script.
5. Move tutorial generation used metadata in SDk and connector guides separately. (Previously in the generate.mjs script)
6. Sync doc translations.
7. Add heading IDs in the above fragments, so they can be kept in generated tutorials upon translation.

Testing

• Build was successful on local machine.
• English version tutorial contents were updated, based on latest SDK and connector guides.
• Locally tested with i18n tutorial translation. More locales will be committed in the follow-up PRs.

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