Change navigation

[maleck13]

Based on conversation here, update docs navigation

Overview (what is currently shown in Getting Started link)
Getting Started
  - Quick Start
  - Install
Concepts and APIs
   - Gateways
   - DNSPolicy
   - TLSPolicy
   - RateLimitPolicy
   - AuthPolicy
Experimental
    - E/W stuff
Components
   - MCG
   - Authorino 
    ...

[jasonmadigan]

Just going to focus on the nav changes. Getting Started guide (multicluster-gateway-controller/docs/getting-started.md) may need some edits because of its new home, outside of MGC - but will create a follow-on issue for this.

Plan to move multicluster-gateway-controller/docs/getting-started.md into index.md in this repo, as seeingly there's no way to tell mkdocs the index or / route is in a doc that's in another repo.

[maleck13]

@jasonmadigan can you ensure to bring that issue up the backlog so it gets discussed at planning

[jasonmadigan]

@maleck13 yep

[jasonmadigan]

I made some edits in https://docs.kuadrant.io/getting-started/ before it landed, and I think there's now less of a need for a follow-on issue. The getting started guide now mentions that the quickstart installs all of Kuadrant locally.