Update docs (#11)

* docs update WIP

* getting started guide updated

* update getting started guide

* clarify github app creation

* add webhook secret to getting started guide and gh-flow app

* restructure Readme

* fix the Organization assumption

* add mermaid diagram of the event flow

* devtunnel feature to devcontainer

* throw all the exceptions and add the history to the prompt

* Update github-flow.md

* update readme

.devcontainer/devcontainer.json

@@ -8,17 +8,14 @@
     "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
 	"features": {
 		"ghcr.io/devcontainers/features/azure-cli:1": {},
-		"ghcr.io/devcontainers/features/common-utils:2": {},
+		"ghcr.io/devcontainers/features/common-utils:2": {
+			"configureZshAsDefaultShell" : true
+		},
 		"ghcr.io/devcontainers/features/docker-in-docker:2": {},
 		"ghcr.io/azure/azure-dev/azd:latest": {},
-		"ghcr.io/devcontainers/features/node:1": {
-			"nodeGypDependencies": true,
-			"version": "18",
-			"nvmVersion": "latest"
-		},
-		"ghcr.io/azure/azure-dev/azd:0": {
-			"version": "stable"
-		}
+		"ghcr.io/devcontainers/features/node:1": {},
+		"ghcr.io/azure/azure-dev/azd:0": {},
+		"ghcr.io/stuartleeks/dev-container-features/dev-tunnels:0": {}
 	},
 	"postCreateCommand": "bash .devcontainer/startup.sh",
 	"hostRequirements": {