"Configure Clang Static Analyzer and checkers" document is misleading as superflous

[dkrupp]

I recommend removing this doc as all teh configuration possibilities are already described in the https://github.com/Ericsson/codechecker/blob/master/docs/analyzer/user_guide.md#analyzer-configuration.

We should also change the references from the usage (howto) guide to the Analyzer Usere guide instead.