sign up login loading animation added

[GautamRaj-12]

Fixes #173

Implemented a loading state to indicate whether a login/signup process is ongoing. Utilized conditional rendering to display a spinner until the process completes after a user click. The spinner is styled with the primary color to seamlessly integrate with the website's accent, ensuring a cohesive visual experience.

All the edge cases have been handled. Checklist:

• [x] I have tested my changes.
• [x] My code follows the project's coding standards.
• [x] I have updated the documentation (if applicable).

Here are the recordings https://github.com/ani1609/Spendwise/assets/64408989/639309f2-64d0-4d28-b3fc-5143c024c8b4

https://github.com/ani1609/Spendwise/assets/64408989/2599f005-bdb8-4cb3-8b30-188b1ad28521

https://github.com/ani1609/Spendwise/assets/64408989/135b1c3a-c6e4-4222-b4e3-bd164fc07e57

https://github.com/ani1609/Spendwise/assets/64408989/3276552c-bcbb-48b8-9ff5-5916c92a3114

https://github.com/ani1609/Spendwise/assets/64408989/9ed8485c-a31f-40fb-b577-7dae6bf332dc

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