Improve codes of the index.html file.

[BaseMax]

• Improve code.
• Change "/>" to ">".
• Remove extra spaces, tab.
• Improve code and ident of the files...
• Remove extra images, CSS, and JS directory, Load googletagmanager globaly…
• Remove font-awesome directory, Move images directory to assets, Fix bug of the footer in small device…
• Add download page from yoosofan repo, Add icon to all of the pages, ...
• ...