Redesign homepage

[AminForou]

This pull request updates the landing page for GSC Explorer, focusing on improving the user interface, user experience, and overall design aesthetics. Key changes include:

1. Implemented a sticky header for improved navigation
2. Redesigned the hero section with a more balanced layout
3. Added a "Key Benefits" section with iconography
4. Revamped the FAQ section with an interactive accordion-style layout
5. Introduced a new newsletter subscription section
6. Improved typography using Google Fonts (Montserrat)
7. Enhanced color scheme and visual hierarchy
8. Added Material Icons for improved visual communication
9. Implemented responsive design improvements for better mobile experience
10. Streamlined CSS with more consistent naming conventions and structure

These changes aim to create a more modern, engaging, and user-friendly landing page that better communicates the value proposition of GSC Explorer.

[TheMihirNaik]

Hi Amin, Pardon me for my naive question. Collaborating on Github is new to me. I see your commit has removed Gunicorn, Flask and Pymongo while adding many other things. Do you know what are these for? As I understand you are only editing Homepage HTML file, and adding custom CSS styles in the same file so I'm not sure if this is needed.

[TheMihirNaik]

Hi Amin, Pardon me for my naive question. Collaborating on Github is new to me. I see your commit has removed Gunicorn, Flask and Pymongo while adding many other things. Do you know what are these for? As I understand you are only editing Homepage HTML file, and adding custom CSS styles in the same file so I'm not sure if this is needed.