feat(menu): removed MenuModal usage in favor of a responsive single HTML menu template

[pixu1980]

Description

• Removed MenuModal in favor of a responsive single HTML menu template

Other changes

• Aligned LangSelector separator width to the MainMenu separator width (2px)
• Moved fadeInUp animation inside the navbar.module.scss

Bonus ;-)

• Added stagger animation for menu items in mobile mode
• Removed underlines for menu items in mobile mode

Notes

• This is preparatory to fix the Theme Switcher issue add light theme + theme switch #13
• Considering now the HTML for the menu items is one and only, SEO should benefit from this update

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