Added Dark theme to the Travel Service page.

[Deepika14145]

Related Issue

Successfully added dark theme to the travel service page.
Fixes: #1555

#Description:
Now the user can switch between dark and light mode on this page also.

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.

[github-actions]

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