Social info twitter

[arc3x]

Description

• Added icon alias for Twitter FA icon
• Added \twitter social link

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have checked that the original example is succesfully built on circleci
  -- Build failed installing Git on circle. Unrelated to PR. Builds fine locally.