* Use descriptive titles (verb+ing) to better find the topic
* Structure the content with (sub)sections
* Try to structure the different sections with list if there
  are different options to make it more readable
* Document other, possible unknown features

* Change titles to using verb instead of noun

* Adding version information in docs/conf.py

Currently, the version of semver is imported (using
from semver import __version__).

To avoid importing semver, version string could be managed
through bumpversion2. However, this is out of scope for
this PR.

* Improve entry page

* Improve main title with semver's version and a catchy phrase
* Move the |latest-version| placeholder to the other placeholders
  like build status, downloads etc.
* Remove the "Welcome bla" heading as it introduces a lonly section
  and it is mostly useless
* Add a short explanation about the "version style" major.minor.patch
  (cited from semver.org)
* Reference the other parts with just the filename (with the .rst extension)
  and without the title. The title is automatically retrieved from
  the file, no need to repeat it. This makes the overall doc more consistent.
* Change py.test -> pytest

* Fix #142: Improve usage documentation

* Use descriptive titles (verb+ing) to better find the topic
* Structure the content with (sub)sections
* Try to structure the different sections with list if there
  are different options to make it more readable
* Document other, possible unknown features

* Silence flake8 with "noqa: E402"