[docs]: Restructure project README

[tgcjananga]

Purpose

Refresh the Open Cloud DataCenter repository README to provide a clearer introduction to the project, its architecture, and its main components.

Changes

• Added a new Open Cloud DataCenter README banner.
• Reorganized the architecture overview.
• Clarified the two platform interaction paths:
  • Self-service through dcctl, cloud-ui, and the control plane.
  • Infrastructure management through Terraform.
• Added clearer descriptions of the following branches:
  • terraform
  • operators
  • controlplane
• Reorganized the CLI and web-console demonstrations.
• Removed outdated or duplicated README content.

Summary by CodeRabbit

• Documentation
  • Added a repository banner and status badges.
  • Expanded the architecture overview and documented key branches.
  • Added issue-reporting and contribution guidance.
  • Updated control-plane branch references.
  • Removed outdated repository diagrams, branch tables, and roadmap content.

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Review details

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 0603f5c4-708d-4643-9b21-e76e032ef7c9

📥 Commits

Reviewing files that changed from the base of the PR and between 86ba6e6 and ae5e24a.

📒 Files selected for processing (1)

• README.md

📝 Walkthrough

Walkthrough

The README was reorganized with repository badges, an architecture overview, branch descriptions, control-plane linking, issue-reporting guidance, and contribution guidance. Older repository-organization content and the roadmap were removed.

Changes

README documentation

Layer / File(s)	Summary
Architecture and contribution documentation README.md	The README adds repository badges, architecture paths, stack branch descriptions, a control-plane link, issue-reporting guidance, and contribution guidance. It removes the former organization diagram, branch table, and roadmap content.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: hiranadikari

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the purpose and changes but omits the required Testing and Checklist sections and uses Purpose instead of Summary.	Add Summary, Testing, and Checklist sections, and document validation results and checklist completion.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the README restructuring, which is the main change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@README.md`:
- Around line 18-20: Update the README statement describing the main branch:
either add a link to the externally maintained roadmap or remove “+ roadmap” so
the description accurately reflects the page’s contents.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 48f0c66e-0d6d-47ee-b7eb-f5cc8765e869

📥 Commits

Reviewing files that changed from the base of the PR and between 25cb78e and 86ba6e6.

⛔ Files ignored due to path filters (1)

• docs/media/RepoBanner.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md