feat: Created a pop up for discount for trip packages webpage

[suhanigupta23]

Title and Issue number

closes issue #886

Code Stack : HTML, CSS , JS used

Description

created a pop up for discount for trip packages webpage. The pop up appears after 5 seconds of loading the webpage to appear it as a pop up. Also a close button is also available in the top right corner to close the pop up.

Video/Screenshots (mandatory)

Type of PR

• [x] Feature enhancement

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:

Please tell if any changes required.

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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