[WIP] Add initial Coming Soon landing page for ZemoLibrary

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>Create the initial "Coming Soon" landing page</issue_title>
<issue_description>## Summary

Replace the default Angular landing page with a simple, modern "Coming Soon" page for ZemoLibrary.

This is the first public-facing page of the project and should provide visitors with a clean introduction while development is in progress.

Requirements

• Replace the default Angular page.
• Display the project name ZemoLibrary.
• Display a "Coming Soon" message.
• Include a short description of the project.
• Ensure the layout is responsive.
• Use semantic HTML where appropriate.
• Keep the design simple and modern.
• Do not introduce additional frontend frameworks or libraries.

Nice to Have

• A subtle icon or illustration.
• Smooth but lightweight animations.
• A link to the GitHub repository.
• A footer with the current year.

Acceptance Criteria

• The application builds successfully.
• Existing frontend tests continue to pass (or are updated if necessary).
• The page displays correctly on desktop and mobile.
• No console errors or warnings.
• The implementation follows Angular best practices.

Screenshots

Please attach before and after screenshots to the pull request.

References

• Angular: https://angular.dev/</issue_description>
• Closes Create the initial "Coming Soon" landing page #1

Comments on the Issue (you are @copilot in this section)

• Fixes Create the initial "Coming Soon" landing page #1