Empty States and Quickstart Page #3617

This issue is to implement the suggestions from the excalidraw here

There are notes in that excalidraw, but the main points here are to:

• Create a new "quickstart" page that allows the user to create the example tools from feat: ship the kagent-tools skills with a k8s-agent, and add skills to the agent template form #3554 using a wizard.
• Update the empty states in the tabs for agent/agenttemplate/harness to link to the quickstart if there is no data.
• Create a nice empty state for the dashboard that links to the quickstart page if no agent/agenttemplate/harness resources found.
• When there is data on the dashboard, there should still be a button there to go to the quickstart page.
• Add a button next to the create buttons on the /agents page that goes to the quickstart.

We should have an onboarding empty state for kagent /agents page that allows you to fill it with built-in example agenttemplates.