[DOC] Update Docker install guide (openvinotoolkit#3055)

* [DOC] Update Docker install guide

* [DOC] Add proxy for Windows Docker install guide

* [DOC] move up prebuilt images section

* Update installing-openvino-linux.md

* Update installing-openvino-docker-linux.md

* Update installing-openvino-docker-linux.md

Formatting fixes

* Update installing-openvino-docker-linux.md

Fixed formatting issues

* Update installing-openvino-docker-windows.md

Minor fixes

* Update installing-openvino-docker-linux.md

Fixed formatting issues

* [DOC] update text with CPU image, remove proxy for win

* Update installing-openvino-docker-windows.md

Minor fixes

* Update installing-openvino-docker-windows.md

Minor fix

* Update installing-openvino-docker-windows.md

Minor fix

* Update installing-openvino-docker-windows.md

Co-authored-by: Andrey Zaytsev <andrey.zaytsev@intel.com>

Author: generalova-kate