Improve Top-Nav navigation, add Contact us CTA

[MantisClone]

Definition of Done

From right to left 👈

• [ ] Remove Social Media (SM) links from the top-nav (keep the bottom nav ones)
• [ ] Add Contact us call-to-action (CTA) button with Calendly link; green with white text
• [ ] Rename Docs to Integrate in your app ↗️
• [ ] Add Need help? drop-down with options:
  • [ ] Github Discussion ↗️
  • [ ] Discord ↗️
• [ ] Add Network with options:
  • [ ] Requests
  • [ ] Payments
• [ ] Add ↗️ icon to the right of Request Network link
• [ ] Add Home

[aimensahnoun]

I believe that the Need Help section would be better at the footer than the top nav