docs: update README

[hjbugajski]

Summary

• Added archive notice indicating project is no longer actively maintained as of September 2025
• Updated README with proper description explaining ApplicationTrackr is an Angular-based web application for job tracking
• Maintained all existing technical documentation for development, build, and testing instructions

Test plan

• Verified README formatting and content accuracy
• Review updated documentation before merging

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

Adds an archive notice to the README and updates the project description while keeping existing development, build, and testing instructions intact.

• Adds an Archive Notice indicating the project is no longer maintained as of September 2025
• Updates the project description (Angular-based, Material, Firebase)
• Retains existing Angular CLI-generated sections

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[Copilot]

Project name capitalization is inconsistent with the new description ('ApplicationTrackr'). Update the H1 to use the correct casing.

Suggested change

	# Applicationtrackr
	# ApplicationTrackr

[Copilot]

The README now states the app is built with Angular 18, but also says it was generated with Angular CLI 12.2.2, which suggests Angular 12. Clarify or align versions to avoid confusion. For example: 'Originally generated with Angular CLI 12.2.2; the current codebase targets Angular 18.' or update the CLI version if the project was actually upgraded.

Suggested change

	This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 12.2.2.
	Originally generated with [Angular CLI](https://github.com/angular/angular-cli) version 12.2.2; the current codebase targets Angular 18.

[Copilot]

[nitpick] Minor grammar improvement for readability. Suggest: 'ApplicationTrackr is an Angular-based web application designed to help job seekers track and manage their job applications. It is built with Angular 18 and Angular Material, with Firebase for data storage and authentication.'

Suggested change

	ApplicationTrackr is an Angular-based web application designed to help job seekers track and manage their job applications. Built with Angular 18, Angular Material, and Firebase integration for data storage and authentication.
	ApplicationTrackr is an Angular-based web application designed to help job seekers track and manage their job applications. It is built with Angular 18 and Angular Material, with Firebase for data storage and authentication.