Added aria attributes to login and signup forms

[Avinash905]

🛠️ Fixes Issue: #173

👨‍💻 Changes proposed:

• I've added aria-label attributes to the component to indicate that it represents a form and provides a descriptive label for screen readers.
• Similarly, I've added aria-label attributes to the components to label the email and password inputs and added aria-describedby attribute which has the id of the error element.
• The error messages and navigation links have role="alert", role="navigation" and added id attribute which connects the element with the , respectively, to provide additional context for screen readers.
• Finally, the component has an aria-label attribute to label the Sign In button.

📝 Additional Notes

Discord username

zenzovio

📷 Screenshots

N/A

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] The title of my pull request is a short description of the requested changes.
• [x] I am a participant of GSSOC23