Unite scripts under samples folder and the snippets in docs/source/examples.rst

[ohadmo]

Currently, there are two things to concern about:

1. With every change to the user API, we need to update both - the sample applications, and the snippets in the documentation which are pretty similar. We need to find a way to embed those sample python scripts into the .rst files either by using the https://www.sphinx-doc.org/en/master/usage/restructuredtext/roles.html#role-download or by having a pre-step before sphinx-build is called which replace placeholders with each script content.

2. In addition to the unit tests, we should have a script in the root directory that executes all the samples under the samples folder (to be executed from the /c/gpu/build.sh script and the pre-push hook). We can test the code in the documentation by using the doctest extension: https://www.sphinx-doc.org/en/master/usage/extensions/doctest.html

[ohadmo]

The 1st section is addressed in PR #111, we decided to keep a different implementation for the documentation snippets and samples.

Regarding the 2nd section, in PR #111 we test the documentation snippets. The sample scripts will be added to the CI in Issue #110 & #107