Example outputs for plugin

[Scot3004]

closes #2

Updated cookbook with screenshots and example for each title

[perrygoy]

Thanks again, @Scot3004! I had a few suggestions for this PR, but this is a definite improvement to the docs.

[perrygoy]

Only a small gripe—would you mind putting the screenshots into an images folder? So it looks like this:

docs/
- images/
-- allure_screenshot.png
-- allure_with_plugin.png
-- allure_without_plugin.png

[perrygoy]

I don't think this section is necessary—if someone's arrived at this documentation, they are probably here because Allure doesn't show the steps, so they probably don't need to see the "before" shot.

[perrygoy]

Make sure "Selenium" is capitalized!

[perrygoy]

We have intersphinx for exactly this case! First, you'll need to edit docs/conf.py a little—find the intersphinx_mapping dict and change it to this:

intersphinx_mapping = {
    "screenpy": ("https://screenpy-docs.readthedocs.io/en/latest/", None),
    "screenpy_selenium": ("https://screenpy-selenium-docs.readthedocs.io/en/latest/", None),
}

Then, you can make this replacement here:

`SaveScreenshot <https://screenpy-selenium-docs.readthedocs.io/en/latest/extended_api/actions.html#screenpy_selenium.actions.SaveScreenshot>`__
.. to
:external+screenpy_selenium:class:`~screenpy_selenium.actions.SaveScreenshot`

The advantage here is that this link will still work if the URL for SaveScreenshot changes for some reason.

[perrygoy]

I think you could link the github example here:

In the `github example <https://github.com/ScreenPyHQ/screenpy_examples/blob/trunk/screenpy_selenium/github/features/test_github_search.py#L44-L54>`__,
we go to the github page
and find the ``screenpy_examples`` repository

(note the double-`s around screenpy_examples—RST uses backticks as special characters, so you need to double them if you want it to look like code instead.)

[perrygoy]

Thanks for the quick turnaround, and for improving the docs!