refine the website structure

[haoqing0110]

Describe the enhancement
A clear and concise description of what the enhancement request is.

More and more fields and operations are added to OCM, like rollout strategy, placement strategy, addon template, manfestworkreplicaset, etc, they are all mixed in the existing "Concept" section. This increases the mental load for OCM beginners, and makes users confused about like, addon vs manifestwork, addon-framework vs addon template.

• Concept:

  • From @mikeshng: surface our core concepts: "Cluster Inventory", "Work Distribution", "Content Placement", "Add-On Extensibility" refine the website structure open-cluster-management-io.github.io#416
  • Move policy and control plan to quick start -> addon & integrations. refine the website structure open-cluster-management-io.github.io#416

• Quick Start:

  • move the complex operations like "rollout strategy", and "placement strategy" to Quick Start.

• Add FAQ page, including frequently asked questions, like why use OCM? addon vs manifestwork, addon-framework vs addon template. add faq page open-cluster-management-io.github.io#448

• @xuezhaojun for the version-controlled website.

• support search in website.

[xuezhaojun]

The plan and progress of doc versioning:

1. Apply for netlify's free PRO plan for open-source projects:
   • [Done] On-going PR: Add netlify into doc website. open-cluster-management-io.github.io#444 @haoqing0110
   • [Done] After the PR is merged, I'm will apply for the free plan in here: https://www.netlify.com/legal/open-source-policy/
2. Add versioning in main and other release branches:
   • [WIP] WIP: Update hugo.yaml to include version URLs for v0.15 and main open-cluster-management-io.github.io#447
   • [TODO] We should also add a release for v0.15
3. Finally, we need to change the DNS record to point to netlify. [Waiting] @gurnben Could you help us to complete this step?

dns1.p07.nsone.net
dns2.p07.nsone.net
dns3.p07.nsone.net
dns4.p07.nsone.net

cc @haoqing0110 @qiujian16 @mikeshng

[qiujian16]

@gurnben should have access to dns record