feat: Update Hero Section with Short and Relevant Content

[akshay0611]

Summary:
This PR updates the content of the hero section to improve clarity, relevance, and engagement while keeping the text concise. The changes aim to better communicate the platform's strengths and value proposition.

Changes Made:

• Rewrote <p class="hero-subtitle"> to emphasize personal transformation.
• Rewrote <h1 class="h1 hero-title"> to focus on fitness beyond diet.
• Rewrote <p class="hero-text"> to highlight expert guidance and personalized plans.
• Updated call-to-action button text for better alignment with the theme.
• Replaced Skype with Instagram in the social icons and added aria-label attributes for accessibility.
• Ensured alignment with existing CSS styles and framework conventions.

Testing:

• Verified responsiveness across different screen sizes.
• Ensured proper rendering of the hero section and its content.

Related Issue:
Closes #1