I made a docset for OpenResty, which can be used in dash or zeal.
Now you can search the api without opening a group of tabs.
The docset can be downloaded from: https://www.dropbox.com/s/gg1gheexmt1zapx/OpenResty.docset.zip?dl=0
The script to generate OpenResty.docset: https://github.com/spacewander/pretty-openresty-docs/tree/master/dash
I will contribute it to dash once the docset is perfect.