Improve the UX by adding stepper for proposal and vault creation

[adityabhattad2021]

Addresses #36 To improve the UX for vault and proposal creators, modified the forms to create proposals and funding vault, to use stepper. Now both the vault and proposal creation form is broken down into small steps.

Now in the UI the steps for vault creation are:

1. Add basic information 2 Add token configuration
2. Add funding parameters
3. Review and submit
4. Add funds to the vault (optional)

https://github.com/user-attachments/assets/5b69a9c0-e3c5-4390-b99e-6192e5683691

Steps for proposal creation:

1. Select the active funding vault
2. Add proposal information
3. Add request amount
4. Add receiver's wallet address
5. Review and submit

https://github.com/user-attachments/assets/bfe4e8b9-55da-4b3f-b2fc-3f3022525f9d

Changes:

Frontend:

• Add vault-form-wrapper.tsx with logic for the stepper inside it and modify the vault form.tsx to break the form into steps.
• Add proposal-form-wrapper.tsx with logic for the stepper inside it and modify the proposal-from.tsx to work with it.
• Remove old routes vault/new and proposal/new
• Add new routes create/vault and create/proposal
• Modify navbar.tsx and mobile-navbar.tsx to add this routes