Added Dark theme to the Travel Service Page

[Deepika14145]

Related Issue

I have added Dark mode to the Travel service page now the user can toggle between dark and light mode for this page also.

Fixes: #1555

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): _______________

Screenshots:

Checklist:

• I have made this change from my own.
• I have taken help from some online resources.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers and screenshots after making the changes.

Please review my PR and add labels as per my work @PriyaGhosal

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