I admit, it sucks that OneManga have shut down the reading part of their site. But. I have since visited the site several times, and can affirm it has become one of the most useful directories on the web. You can look up a title and garner all the relevant information you need, before being directed towards other manga you may enjoy.
It would be very easy to abandon OneManga, just because we can’t get our weekly/monthly/sporadic fix of our favourite manga there anymore; however I urge you not to. They are still doing amazing, but different, work. It’s up to us to support them.