These topic were replaced by a couple of pharagraphs in the
`contributing` section.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

This will need to be replaced with actual FAQs in the context of the
project. The generic git related entries right now are of little value.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

Signed-off-by: Arul Kumaran <arulkumaran.devarajan@huawei.com>

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

* Signed-off By: Arul Kumaran <arulkumaran.devarajan@huawei.com>

> Supported boards moved to new folder
> Titles updated as per review for code and tools downloading
> References and link issue fixed