Migrating 'Thumbnail' component

[Omal Perera]

path to the component

• /src/atoms/Thumbnail.js

DoD

• convert the file to .ts extension
• define an interface for props in the component
• define an interface for internally used states (if any)
• define types for variables (if any)

Contribution steps can be found - https://github.com/99xt/first-born/wiki/Migrating-to-TypeScript

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