Updating devcontainer setup and related documentation

.devcontainer/devcontainer.json

@@ -1,12 +1,40 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/javascript-node
 {
-    "build": { "dockerfile": "Dockerfile" },
-    "mounts": [
-        "source=abs-node-node_modules,target=${containerWorkspaceFolder}/node_modules,type=volume"
-    ],
-    "features": {
-        "fish": "latest"
+	"name": "Audiobookshelf",
+	"build": {
+		"dockerfile": "Dockerfile",
+		// Update 'VARIANT' to pick a Node version: 18, 16, 14.
+		// Append -bullseye or -buster to pin to an OS version.
+		// Use -bullseye variants on local arm64/Apple Silicon.
+		"args": {
+			"VARIANT": "16"
+		}
 	},
-	"extensions": [
-		"eamodio.gitlens"
-	]
+	"mounts": [
+		"source=abs-server-node_modules,target=${containerWorkspaceFolder}/node_modules,type=volume",
+		"source=abs-client-node_modules,target=${containerWorkspaceFolder}/client/node_modules,type=volume"
+	],
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	"forwardPorts": [
+		3000,
+		3333
+	],
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "sh .devcontainer/post-create.sh",
+	// Configure tool-specific properties.
+	"customizations": {
+		// Configure properties specific to VS Code.
+		"vscode": {
+			// Add the IDs of extensions you want installed when the container is created.
+			"extensions": [
+				"dbaeumer.vscode-eslint",
+				"octref.vetur"
+			]
+		}
+	}
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
 }