Refactor header social links

[rhagenson]

Hello Byungjin Park (@posquit0), I am a huge fan of your awesome CV template and have been using it for a few years. During my use I have made some quality of life improvements that I wanted to contribute back upstream. The following changes have been made (in order of decreasing niceness of quality-of-life improvement):

• Make it so socials are formatted in the same order as in the source file (i.e., allows deciding the order by rearranging lines in the source file)
• Use the \needspace{...} command from the needspace package to prevent a page break after a section or subsection header so section content always starts on the same page as its header
• Reorder \cventry{...}{...}... so that entries are: top-left, top-right, bottom-left, bottom-right, additional details (I always got this order wrong so now I use it as \cventry{...}{...}<newline>{...}{...}<newline>{...} so content in source matched where it will print in the final document)
• The spacing of \cvhonor{...} has been updated to accommodate longer left and right entries (change made to use a date range on the left and non-domestic address on the right)

I anticipate you will want me to squash these commits before merging as my issue numbers do not correspond to your issue numbers so merging as is would create fake "this issue was referenced in commit" messages in the issue tracker, hence opening as a draft PR. If you want the changes upstream I will go through squashing, but do not want to delete the history prior to review.

[OJFord]

@rhagenson, this seems excellent, I've been wanting to tidy this up somehow - if you're still around and using ACV, if you wanted to rebase this (it would require a little work I'm afraid - I refactored this recently slightly in 669ac14 - the important thing is the accsupp use to give a sensible replacement like 'homepage' instead of 'HOUSE-CHIMNEY' for the fa icon) then I'd gladly review with an intent to merge.

Cheers.