Update ShellWrapper and the landing page again

[daxian-dbw]

PR Summary

Update ShellWrapper and the landing page again based on the branding team's decision and the design feedback.
The property Description is added to ShellWrapper to allow the application that hosts Shell Copilot to define the message to show at the startup of Shell Copilot.

The sidecar view after update:

The JSON file used for --shell-wrapper is as follows (context key is optional):

{
  "name": "az copilot",
  "banner": "Copilot",
  "description": "Copilot can generate Azure CLI scripts, help you find commands and command sequences, troubleshoot errors, and more for managing Azure resource.",
  "prompt": "Copilot",
  "agent": "az-cli",
  "context": {
    "tenant": "00000000-0000-0000-0000-000000000000",
    "subscription": "00000000-0000-0000-0000-000000000000"
  }
}

[pull-request-quantifier-deprecated]

This PR has 54 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Small
Size       : +23 -31
Percentile : 21.6%

Total files changed: 5

Change summary by file extension:
.cs : +23 -31

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