[doc] updating conf.py

A lot of texts in conf.py were still talking about the old HidaV sub project,
mostly these parts were rewritten and some minor changes to the configuration
itself were made.

This task was done in connection with Github Issue #26.

Signed-off-by: Erik Bernoth <bernoth@dresearch-fe.de>
Acked-by: Angelika Tobisch <tobisch@dresearch-fe.de>
Acked-by: Andrea Schönfeldt <schoenfeldt@dresearch-fe.de>
[doc] complete rewrite of index.rst

Which had to be done, because the changes to the old version were just way too
big.

Also see Github Issue #26.

Signed-off-by: Erik Bernoth <bernoth@dresearch-fe.de>
Acked-by: Angelika Tobisch <tobisch@dresearch-fe.de>
Acked-by: Andrea Schönfeldt <schoenfeldt@dresearch-fe.de>
[doc] new page getting-started

Added a page that explains a MONK user what he can do with MONK.

Belongs to Github Issue #27.

Signed-off-by: Erik Bernoth <bernoth@dresearch-fe.de>
Acked-by: Angelika Tobisch <tobisch@dresearch-fe.de>
Acked-by: Andrea Schönfeldt <schoenfeldt@dresearch-fe.de>
[doc] new page contributing

which describes the development process and ways to interact with the
MONK community.

See Github Issue #28 for more info.
Also some of the changes are more about the policies, thus look at Github Issue
 #30 for more details.

This change also includes the changes from Github Issue #21, which added some
info about the environment variables configuration to the old docs.

Signed-off-by: Erik Bernoth <bernoth@dresearch-fe.de>
Acked-by: Angelika Tobisch <tobisch@dresearch-fe.de>
Acked-by: Andrea Schönfeldt <schoenfeldt@dresearch-fe.de>
Review from Angelika

There also is a comment on GitHub that should be considered.

Signed-off-by: Angelika Tobisch <tobisch@dresearch-fe.de>
Acked-by: Erik Bernoth <bernoth@dresearch-fe.de>
Acked-by: Andrea Schönfeldt <schoenfeldt@dresearch-fe.de>
Review from Andrea

Signed-off-by: Erik Bernoth <bernoth@dresearch-fe.de>
Acked-by: Andrea Schönfeldt <schoenfeldt@dresearch-fe.de>
Acked-by: Angelika Tobisch <tobisch@dresearch-fe.de>