Changing /about links to /about-us

Rewrite/redirect issue
Merge branch 'about-link-fixes' into prod
More efficient initial WP_Query
Remove 2nd and 2rd WP_Query calls
Use rewind_posts to reuse initial loop
Cleanup
Merge branch 'locations-wp-query' of https://github.com/zgreen/MITlibraries-parent into locations-wp-query