Replace hand-coded <a> tag with Haml syntax
Replace hand-coded <a> tag with Haml syntax

We'll eventually add a proper `#link_to` helper, but not yet.

Change-Id: I19899ef910ef0fcc2d4c318368a7ee4b5c36354c
Reviewed-on: https://gerrit.causes.com/24891
Reviewed-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>
Tested-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>

causes/twigg,causes/twigg