[DOCS] Restructure EIM documentation

[sgolebiewski-intel]

PR Description

The proposed changes are part of the effort to target modular decomposition of Edge Infrastructure Manager, described in ticket: 79416 and 84758. Changes include:

• creating a section for EIM components (providing new content from respective infra repositories)
• removing duplicated content in the overview.rst, hl_architecture, background.rst files, moving remaining content to the index file.
• reorganizing menu structure
• updating references

Changes

List the changes you have made.

Additional Information

Include any additional information, such as how to test your changes.

Checklist

• Tests passed
• Documentation updated

[Ram-srini]

onboard manager is also acts as a host resource manager responsible to update onboarding status and provisioning status but HostStatus to Running set by node agent by calling hostResource manager's grpc call - https://github.com/open-edge-platform/infra-managers/tree/main/host#edge-infrastructure-host-resource-manager

[sgolebiewski-intel]

Provided an update with: 451670d

[scottmbaker]

I like the overall restructuring. I left a few minor comments that could be addressed earlier. As a high-level point, I think we still have a few levels of indirection between the EIM top page and the components. I have to navigate EIM -> Architecture -> Components -> [a specific component]. I wonder if there's opportunity to collapse one or more of those levels. For example, we could introduce the components at the top level.

[scottmbaker]

While reading through the docs, I found this statement hard to interpret, and it's high up in our list of features. Could we better summarize the 50 edge device concurrent onboarding (prior bullet) together with concurrent 10,000 edge devices and 1000 edge devices for OS provisioning?

[sgolebiewski-intel]

Updated with: 43e0611