changes in nav and inserted image in dex.html | Service Page

[Pruthaa17]

Description

On Services page the navbar's about was not having proper link in href , corrected and Added an image which was not displayed as it was not seen anywhere in the folder.

• Closes #578

Type of PR

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

Screenshots / videos (if applicable)

[Attach any relevant screenshots or videos demonstrating the changes]

Checklist

• [x] I have gone through the contributing guide
• [x] I have updated my branch and synced it with project main branch before making this PR
• [x] I have performed a self-review of my code
• [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 commented my code, particularly in hard-to-understand areas.

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[Anishkagupta04]

Thankyou for your contribution

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