fix(navbar): remove conflicting docsearch deps and CSS overrides

[shreya1510ss]

What has changed?
Issue: The navbar search box was not styled correctly, unlike the default clean look on stock Docusaurus sites.

Cause:
@docsearch/react/@docsearch/core were unnecessarily added directly in package.json, conflicting with the version already bundled by @docusaurus/preset-classic.
Custom !important CSS overrides on .DocSearch-Button in src/css/custom.css were fighting DocSearch's default styling.
Fix: Removed both, restoring the default clean search box look.

Fixes https://github.com/keploy/enterprise/issues/2291

Image after fix

[Copilot]

Pull request overview

This PR restores Docusaurus’ default DocSearch styling by removing direct DocSearch dependencies and eliminating custom CSS overrides that were fighting the upstream styles.

Changes:

• Removed @docsearch/core and @docsearch/react from package.json to avoid version conflicts with the DocSearch version pulled in via Docusaurus.
• Updated yarn.lock accordingly (DocSearch remains as a transitive dependency via @docusaurus/theme-search-algolia).
• Removed !important Tailwind @apply overrides targeting .DocSearch-Button from src/css/custom.css.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Drops direct DocSearch deps so Docusaurus controls the DocSearch version.
yarn.lock	Reflects the dependency graph cleanup after removing direct DocSearch deps.
src/css/custom.css	Removes conflicting .DocSearch-Button overrides to let default DocSearch styling apply.

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