feat: Create Sidebar UI

[JulianaSau]

Fixes Issue/Linear Ticket

This could be an existing issue or a linear ticket My PR Closes #13

Changes proposed

Talk about the things you did eg. files changes, dependencies installed e.t.c Created PluginItem, WorkspaceSidebarItem and SidebarItem Components. Created Workspaces Sidebar UI Created Sidebar UI Updated mantine theme config to include secondary color and primary color from figma design Updated color of Layout to match the figma design

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• [x] My code follows the code style of this project.
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Screenshots/ Videos

[zxenonx]

@JulianaSau Great job.

[JulianaSau]

@JulianaSau Great job.

Thank you😁 @zxenonx