ENGINEERING: Preparing for migration to Heroku

  - set-up to run only on Heroku, *not* locally.
  - for local build, COMMENT OUT LINE 7 & 8, UNCOMMENT LINES 5 & 6

  - moves font-awesome.css into css folder
  - moves font files into new assets/fonts folder
  - removes link to font-awesome.min.css, repoints to css/font-awesome.css
  - removes font-awesome/css folder
  - changes links to font files in font-awesome.css
  - adds contact form emailer via sendgrid
  - updates search function with keywords
  - updates content
	- adds search terms to each content page

  - removes testing code
  - lets Pony fail and be caught instead of sending blank emails
  - tidies up search JSON

  - recasts searchterms arrays as flat lists
  - removes "" wrapping each searchterm
  - changes name of searchterms variable