Consolidate "Getting Started" for Designer using Tabs

[zihanKuang]

Description:

The current "Getting Started" section (https://docs.layer5.io/kanvas/getting-started/starting-helm/) for the Designer has an open question regarding the best approach to document the different ways to create a design. Currently, there are separate pages for starting from scratch and from a Helm Chart.

As we are adding more ways to import designs (e.g., Kustomize manifest, Kubernetes manifest, Docker Compose, Meshery design, Import from Catalog, Import from GitHub, drag and drop), having a single page per starting point might become cumbersome and lead to long documentation.

Proposal:

Consolidate the documentation for different "Getting Started" methods onto a single page using tabs (and potentially tab panes). This would allow users to easily switch between instructions for different import mechanisms while keeping all related information in one place.

Related PR:

• Initial PR discussing the approach: Getting Started: Importing Designs #503
• PR where tabs/tab panes were being tried: Docs: Restructured the layout of "Understanding Tool Modes" #558 (review)