I also think searching github.com using search engine is very useful.
You can try it with 'x gh : <interesting topic>'
It will open our duckduckgo client to search the relatic webpage in github.com.
This feature is kind of experimental and not documented in our website. I just visit your gh-s . I think you might like it.
You can also use 'x hn : <query>' to search hackernews in cli. Same design.