docs: update architecture diagram

[galexrt]

Description of your changes:

I have recreated the architecture in draw.io as I don't think anyone still has the (old) source code for the diagram around. It has slightly less "detail," but now we can easily edit it if needed, e.g., with the ceph exporter coming soon.

Checklist:

• Commit Message Formatting: Commit titles and messages follow guidelines in the developer guide).
• Skip Tests for Docs: If this is only a documentation change, add the label skip-ci on the PR.
• Reviewed the developer guide on Submitting a Pull Request
• Pending release notes updated with breaking and/or notable changes for the next minor release.
• Documentation has been updated, if necessary.
• Unit tests have been added, if necessary.
• Integration tests have been added, if necessary.

[linear]

KSD-133 Create and update architecture diagrams

Examples: https://docs.galexrt.moe/storage/rook/architecture/

• Update the architecture diagram in the Koor docs
• Update other outdated diagrams in the Koor docs

Let's write up a simple architecture diagram that we can use in our intro blog posts. Potentially use Koor Office Hours for it.

[zalsader]

Looks good!

Minor comments on the diagram:

• The original diagram organized pods in columns to show they are located on the same node. I think this could be done here.
• Do we need to show bucket claims too?
• Should we use Koor branding on our website?
• The title "OSDs" in the bottom left corner is not centered.

[galexrt]

@zalsader I have updated it and I think for Koor we should then make it Koor themed.

[zalsader]

Looks great!

[ideepika]

looks great, can we also have it in our KBase knowledge centre some way?