Alt attribute and style to newsletter button

[sofisdev]

Type:

• [ ] cicd: helm, docker & cicd adjustments.
• [ ] feature: new capabilities.
• [X] fix: bug, hotfix, etc.
• [ ] refactor: enhancements.
• [X] style: changes in styles.
• [ ] other: docs, tests.

What's the focus of this PR:

• margin-bottom to the "Subscribe" button on the newsletter page
• altattribute on <img> elements for better accessibility

How to review this PR:

• Run all dependencies with npm install
• Run project locally with npm run dev

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