Replace page.root (#310)
* replace page.root with 'base' variable that knows path level
* deal with case of trailing / in URL
* use link to figure out path for logos
* simplify path building for favicons
* baseurl isn't used in our template so it can removed
* use 'base' variable for path root instead of unecessary http request to
site.url
* replace page.root with 'base' variable that knows path level
* deal with case of trailing / in URL
* use link to figure out path for logos
* simplify path building for favicons
* baseurl isn't used in our template so it can removed
* use 'base' variable for path root instead of unecessary http request to
site.url
* rename variable, consolidate comments
* rename variable in template files
- [DH] _layouts/base.html
- [DH] _layouts/workshop.html