Install instructions in README

[bedeho]

It actually takes a bit of time to find the right place for how to just install hydra CLI, as there are no less than 10 or so links on the landing README. Even on the second try it takes me a few minutes to figure out that I have to do two clicks Docs =>Install Hydra toolkit => destination.

Compare that to something like Webtorrent, which exceptional Github native onboarding

https://github.com/webtorrent/webtorrent

Here the very first step is install steps, I think that would be advisable here. Also, all of the links in the monrepo section links to @dzhelezov fork, and they should also instead link to the subfolder, not the README, becaus you end up having to navigate up to see the actual directory content.