Replaced old twitter logo with new X logo, also replaced and added new…

[kushwahahimanshu22]

… font awesome cdn to ver(6.5.1)

Related Issue

Closes #532

Description

Updated SVG for the twitter logo. Used font-awesome for new logo. Updated font-awesome CDN. Added font-awesome in gallery, codeOfConduct and eventPage.

Screenshots

Checklist

• [ ] My code adheres to the established style guidelines of the project.
• [ ] I have included comments in areas that may be difficult to understand.
• [x ] My changes have not introduced any new warnings.
• [x ] I have conducted a self-review of my code.