Click/Flask feedback

[encukou]

• [x] Twitter auth is needlessly complicated, and it requires giving your a telephone number to Twitter. I think it should come after Github API, as an example of auth problems, rather than people's first look at Web APIs.

• [x] The space in 'token ' for the Github authentication header is far too easy to overlook, there should be a note about it.

• [x] The click example explains just the minimum needed for the project. I'm not convinced that's a good introduction to the library. I've expanded it a bit in http://naucse.python.cz/2017/pyknihovny-brno/intro/click/ (we'll use that, so fixed)

[melkamar]

I would mention Click's capability to display and animate a progressbar. It's not an essential feature, but it can make some nice looking UI.

[hroncok]

Jen si tady odložím video z přednášky o Clicku od @tomasbedrich pro inspiraci.