Added installation of OSD in GCP using OCM CLI

[rcarrata]

Automated the installation of OSD in GCP using OCM CLI.

[michaelryanmcneill]

Can we split this out into two separate guides? In many of the steps, it mentions "depending on how you do things" which to me would be much clearer if it was split out into: CLI and GUI options.

[rcarrata]

@michaelryanmcneill makes sense also for me. I'll split in two different guides for clarification. Thanks for your inputs!

[michaelryanmcneill]

Clicked on the wrong button to approve 🤦 See previous comment above: Can we split this out into two separate guides? In many of the steps, it mentions "depending on how you do things" which to me would be much clearer if it was split out into: CLI and GUI options.

[rcarrata]

@michaelryanmcneill sorry for the late reply. I've divided into two guides (GUI and CLI) the installation of the cluster, and I've reviewed the result with jekyll serve locally. Kindly review

[rcarrata]

@michaelryanmcneill kindly review with the last changes :)

[rcarrata]

LGTM

[paulczar]

Please update file names, front matter, and section pages according to the new contributors guide. https://github.com/rh-mobb/documentation/blob/main/CONTRIBUTING.md

[rcarrata]

@paulczar adjusted to the proper content to fit with the new contributors guide. Adjusted the hierarchy and the content of the landing page for GCP. Checked with hugo serve locally and all seems to render properly.