feat: seasonal calendar tool scaffolding

[chrismclarke]

Description

• Add scaffolding code for new seasonal calendar tool
• Add feature to allow extension app to display additional links only when running locall
• Add link from extension app home to seasonal calendar tool, available only when running non-production

Discussion

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Preview

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[chrismclarke]

@khalifan-kfan - I've copied most of the scaffolding code from the options tool so hopefully should be familiar to work with, but if you have any issues feel free to let me know

You can run the new tool either from the main extension app yarn start or just standalone yarn start:seasonal-calendar

[khalifan-kfan]

@chrismclarke Thanks for this, It will be a great start.