added Theme Settings

* added themeSettings.json
* themeSettings.json now feeds data for home page slider
* added /theme-settings route for use in Admin
* when on theme-settings route hide header & footer
updated categoryId to categoryIds (plural)

to match latest Storefront API changes
Changes from CR for PR115
fix build
Updated product category urls
fixed descriptions not showing up
Merge pull request #1 from texasag/fixed-descriptions

Fixed descriptions