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

[SumaiyaaRq]

Fixes

• Fixes [Fix] Mobile responsiveness issues in search-index.html #150 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

For the purposes of this DCO, "license" is equivalent to "license or public domain dedication," and "open source license" is equivalent to "open content license or public domain dedication."

Developer Certificate of Origin

Developer Certificate of Origin
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Developer's Certificate of Origin 1.1

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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
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
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    maintained indefinitely and may be redistributed consistent with
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