merge documentation updates from 2020/4 branch#1671

Merged

asuhov merged 4 commits intoopenvinotoolkit:releases/2020/4.0.1from asuhov:2020_4_0_1_docs

Aug 6, 2020

+44,830-183

Commits on Aug 6, 2020

update system requirements (openvinotoolkit#1321 )
Alexey Suhov
committed
Doc Migration from Gitlab (openvinotoolkit#1289 )

ntyukaev
authored and
Alexey Suhov
committed
Update VisionAcceleratorFPGA_Configure.md (openvinotoolkit#1378 )

authored and
Alexey Suhov
committed
Updated documentation for 2020.4 (openvinotoolkit#1434 )

authored and
Alexey Suhov
committed