[Jetnews] Update icons and remove material icons dependency

[JolandaVerhoef]

This commit replaces the Material Icons dependency with local drawable resources for all icons used in the JetNews sample.

[gemini-code-assist]

Summary of Changes

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This pull request significantly refactors how icons are handled within the JetNews sample application. The primary goal is to eliminate the reliance on the Material Icons dependency by replacing all icon usages with custom, locally defined vector drawable resources. This change streamlines the project's dependencies and embeds the icon assets directly within the application.

Highlights

• Dependency Removal: The androidx.compose.material.iconsExtended dependency has been removed from the build.gradle.kts file, reducing the project's external dependencies.
• Icon Source Migration: All instances where Material Icons were used (e.g., Icons.Filled.Home, Icons.Filled.Search) have been updated to use local drawable resources (e.g., painterResource(R.drawable.ic_home), painterResource(R.drawable.ic_search)).
• New Local Icon Assets: A comprehensive set of vector drawable XML files has been added to the res/drawable directory, providing local assets for all previously used Material Icons.

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[gemini-code-assist]

Code Review

This pull request replaces the Material Icons dependency with local drawable resources, reducing the application's size and external dependencies. The refactoring has been applied consistently throughout the codebase.