add favicon to published website (netlify repo)

[mohit5540]

• Favicon is uploaded from builder. This should be sent to netlify repo.
• use Gitlab API.
• This should be updated whenever new Favicon is uploaded.

[gkumar9]

• Favicon is being uploaded from web-builder and is sent to gitlab repo of netlify.
• Gitab API is being used for uploading the image.
• terminated.