Minor UI updates for Talawa

[Nitya-Pasrija]

Describe the solution you'd like

• Fixing the pink colour patch in the homepage
• Navbar updates
• Sidebar sub titles shifting to left so that a flow can be established
• Youtube Icon to reach Palisadoes

Potential internship candidates Please read this if you are planning to apply for a Palisadoes Foundation internship https://github.com/PalisadoesFoundation/talawa/issues/359