fix: add subscribe to newsletter modal on home page

[AdamPawlinski]

Related Issues

closes #EN-311

Short Description of the PR

Add modal for subscribing newsletter on Home Page following the figma design.

Screenshots of Visual Changes before/after (if There Are Any)

Pull Request Checklist

• I have updated the Changelog (V1) v2 and mentioned all breaking changes in the public API.
• I have documented all new public APIs and made changes to existing docs mentioning the parts I've changed so they're up to date.
• I have tested my Pull Request on production build and (to my knowledge) it works without any issues

• I tested manually my code and it works well with both:
• Default Theme
• Capybara Theme
• I have written test cases for my code

• I have followed naming conventions

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[github-actions]

💙 vsf-next-demo successfully deployed at

[AdamPawlinski]

I had to remove mobile observer that causes inifite loop error. Now it should work properly.

[Baroshem]

Only one small proposition for better readability and follow Vue standards :)