refactor(dashboard): tenant cookie -> dynamic route slug

[bryson-g]

resolves https://github.com/littlehorse-enterprises/littlehorse/issues/1137

• Added [tenantId] dynamic route
• Moved file directories
• Updated broken imports
• Modified Navigation component to prepend tenantId to the passed href prop.
  • This was done to make the component less tedious and easier to use, but I think we may want to force the href to include the slug anyways to avoid potential confusion. LMK.
  • Support root page redirect to default tenantId within next.config.mjs
• Ensuring every redirect & href is accounted for with the new route to maintain functionality

[HazimAr]

@sauljabin @coltmcnealy-lh This will help us with detecting metrics for each tenant.

[sauljabin]

@sauljabin @coltmcnealy-lh This will help us with detecting metrics for each tenant.

really good catch, yes