feat: add kapa.ai widget script

[kohasummons]

Summary of change

Adds Kapa AI Widget to the docs

Related issues

• Link to issue1 here
• Link to issue1 here

Checklist

• Algolia search needs to be updated? (If there is a new sub docs project, then yes)
• Sitemap needs to be updated? (If there is a new sub docs project, then yes)
• Checked for broken links? (Run cd v3 && npm run build)
• Changes required to the demo apps corresponding to the docs?

Remaining TODOs for this PR

• Item1
• Item2

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