Add drawer-search block to allow downstream overrides to alter it.
Add drawer-search block to allow downstream overrides to alter it.

18F/regulations-site,18F/regulations-site,tadhg-ohiggins/regulations-site,18F/regulations-site,tadhg-ohiggins/regulations-site,eregs/regulations-site,18F/regulations-site,eregs/regulations-site,tadhg-ohiggins/regulations-site,eregs/regulations-site,eregs/regulations-site,tadhg-ohiggins/regulations-site