Capi query as data attribute

@kelvin-chappell - in lieu of Capi queries expressed as structured data/keywords, put the query literal in a data attribute on the container wrapper. eg:
```
data-capi="lifeandstyle/dating"
```
or, less usefully:
```
data-capi="search?tag=lifeandstyle/homes|lifeandstyle/gardens"
```