BugFix: Made search-index.html page responsive for mobile.

[SumaiyaaRq]

Fixes

• Fixes [Bug] Mobile Responsiveness Issue on search-index.html Page #142 by @wendy640

Description

This PR resolves the responsiveness issues for smaller devices in the search-index.html page .
There are issues related to padding in posts section and overflowing of search-form in smaller devices . I have attempted to fix these issues through this PR.

Technical details

1.Made changes to the style rules defined in vocabulary.css file .
2.More specifically, layout changes have been made to the search section & posts section of the page.

Tests

1. Open the search-index.html file.
2. Right-click and select Inspect (or press Ctrl+Shift+I / Cmd+Option+I on Mac).
3. Click Toggle Device Toolbar (or press Ctrl+Shift+M / Cmd+Shift+M on Mac ).
4. Test with different devices or adjust the viewport sizes.

Screenshots

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

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Developer Certificate of Origin

Developer Certificate of Origin
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(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
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[SumaiyaaRq]

Hi @possumbilities ,
Just following up on this PR. Please let me know if there's anything I need to adjust or improve.
Looking forward to your feedback whenever you get a chance.
Thank you!