Aligned the footer to the bottom of the page

[Sahilll15]

Description

The changes made in this pull request should be briefly described. changed the app.js file to make the footer at the bottom of the page

Resolves: #153

Checklist

Before submitting this pull request, kindly verify that the ensuing checkpoints have been reached.

• [x] Have you adhered to the repository's defined coding convention rules?
• [x] Have you updated the 'documentation.md' file with the method/function documentation?
• [x] Have you sent a message along with the result or response?
• [x] Have you used the try-catch technique?
• [x] Has the method/class been added to the documentation (md file)?

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