Remove deprecated routes and constants, and refactor routing structure

Commit notes

- Deleted unused files including `constants.js`, `router.js`, `routes.js`, and `routeTree.gen.js`, which were no longer needed after recent architectural changes. - Updated routing to reflect new structure, consolidating routes under a more streamlined organization. - Introduced new routes for shared resources and sequencer functionality, enhancing the application's modularity and maintainability. - Adjusted navigation links in the header component to align with the updated routing paths.

This commit aims to simplify the codebase by removing obsolete components and improving the routing architecture for better clarity and performance.