ranged through an array to make social-follow.html more efficient

[zjrohrbach]

not sure if this is helpful, but I made the social-follow.html more succinct by ranging through all of the repetitive code.

This could probably be improved by making sure the title and aria-label attributes are correctly capitalized for each link. I used humanize to try to achieve this, but it does not split 'Stack Overflow' into two words or correctly capitalize 'LinkedIn.'

[budparr]

Thanks for this. We'll review right after the holiday.

[zjrohrbach]

I think this most recent commit fixes most of the capitalization issues. The only remaining problem is that 'Stack Overflow' still renders as one word instead of two.

[regisphilibert]

Thanks @zjrohrbach and sorry for not addressing your PR sooner as it did make a lot of sense. I just merged #422 which refactors the whole social logic of the theme! Thanks for your work!