Fix: Pops up message on successful subscription #891

[nidhipai78]

Title and Issue number

Title : Pops up message on successful subscription in the main page.

Issue No. :#891

Code Stack : HTML | JS

Close #891

Description

Subscription successful message added when email id is entered.

Video/Screenshots (mandatory)

Type of PR

• [X] Bug fix
• [ ] Feature enhancement
• [ ] Documentation update
• [ ] Other (specify): ___

Checklist:

• [X] I have performed a self-review of my code.
• [X] I have commented my code, particularly in hard-to-understand areas.
• [X] I have tested the changes thoroughly before submitting this pull request.
• [X] I have provided relevant issue numbers, screenshots, and videos after making the changes.
• [X] I have gone through the contributing.md file before contributing

Additional context:

The success message gets displayed on successful subscription.

Are you contributing under any Open-source programme?

• [X] I am contributing under GSSOC'24
• [ ] I am contributing under VSOC'24

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