Support for WP search with pattern `/search/:query`

Frontity Roadmap :biking_man:

ā€” Feature card

Description

Right now, there is a handler that supports the default WP search, ?s=:query, but we should also support the pattern /search/:query, as WP also supports it.

User stories

As a Frontity user
I want to be able to use the pattern /search/:query in my search urls
so that I can use the pattern I prefer.

Possible solution

We can create a handler for this.