Chore: cleanup unused dependencies, add proper uninstall, and fix installation

[up1512001]

• Added an admin notice for cases when someone clones directly from the GitHub repository, providing better guidance and avoiding fatal error.
• Loaded the plugin on the plugins_loaded hook.
• Added an uninstall.php file to clean up options after the plugin is deleted.
• Removed unused packages server-side-render and block-serialization-default-parser.
• Added translations file.
• Fix linting issues.

[Copilot]

Pull Request Overview

This PR performs maintenance tasks to improve the OneDesign plugin's installation experience and clean up unused dependencies. It addresses issues that could occur when users clone the plugin directly from GitHub and ensures proper cleanup when the plugin is uninstalled.

• Added comprehensive installation guidance for GitHub repository clones with admin notices
• Implemented proper plugin lifecycle management with uninstall cleanup and hooks optimization
• Removed unused WordPress dependencies and added translation support

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
uninstall.php	New file that cleans up plugin options when the plugin is deleted
package.json	Removes unused WordPress packages (block-serialization-default-parser and server-side-render)
onedesign.php	Adds GitHub clone detection with admin notice and moves plugin loading to plugins_loaded hook
languages/onedesign.pot	New translation file containing all translatable strings
inc/classes/class-plugin.php	Refactors constructor to use separate setup method

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