new pages and content, site-wide edits to location links

- added "our story" folder and page
- added our story link to footer
- changed "Employment Opportunities" to "Employment" in footer
- changed "careers" folder to "employment"
- added content to employment page (still incomplete though)
- changed all instances of "location-name" to "texas-dallas"
- added "Northpark Mall" to the top part of all the location sub-pages,
this is intended to physical location of each restaurant (also included
HTML comment on texas-dallas page)
- changed all instances of "customers" to "guests" (only found on
homepage and employment page)