feat(web): Add Local Studio sidebar & add header items

[antonjoel82]

What changed? Why was the change needed?

• Add local studio sidebar with loading state
• Used dummy data for the time being to get a better look at the screen with more data.

TODOs

• Empty state for the page
• Fill-in placeholders / TODOs
• Connect the routing -- I have not heard our plan for this, so I left some dummy functions

Screenshots

https://github.com/novuhq/novu/assets/47441786/59375051-5350-4bf3-8e3f-5349f472e9f8

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