docs: reorganise explore events

[tixxdz]

This re-organises the explore events, after the install tetra cli guide.

Also it splits the same guide by deployment methods

Goes on top of https://github.com/cilium/tetragon/pull/995

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[mtardy]

Hey @tixxdz I have a review pending on this, it has been conflicted for a few months now, do you want to close this or rebase it? Thanks!!