Integrate README with wiki page

[mhalano]

TL;DR: Put all the vital information for install and use in the README instead of split between README and wiki. Put the advanced topics and longer explanations in the wiki.

Maybe can be a good idea to put the wiki page together in the README, so the README becomes a one-stop page to use the application. My main concern is related how to use the tool, like the default shortcut, that, I think, should be part of the README. Perhaps details about plugins, and more advanced features could be mentioned in the wiki with a link in the README.