Polish documentation

[dhodovsk]

Update documentation before we can ship it:
Ideas:

• Provide lists of checks for ecosystem
• Show how it can be used as python module

[phracek]

List of checks will be generated automatically by each commit.
I suggest structure like:

• index.rst ... which will contain a basic information and how it can be used from CLI
  |- check_list ... which will contain a full set of checks
  |- Python API ... shows, how it can be used from python

Any other idea?

[TomasTomecek]

container

I do the same thing when I intend to write contain. We are cursed.

One nit: s/check_list/list_of_checks/