Initial import of handlebars templates

Ported from https://github.com/shahyar/wmf-flow1
at commit 59f9a69db50b4d3ddc067b77159d2c0277800255

Change-Id: I9043164e3f74404b15e14ea80a5c1fc2c27c7f82
Merge "Initial import of handlebars templates" into frontend-rewrite