onboarding: Create basic onboarding page (#34723)

Release Notes:

- N/A

---------

Co-authored-by: Ben Kunkle <ben@zed.dev>

Cargo.lock

@@ -10983,6 +10983,23 @@ dependencies = [
  "workspace-hack",
 ]
 
+[[package]]
+name = "onboarding"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "command_palette_hooks",
+ "db",
+ "feature_flags",
+ "fs",
+ "gpui",
+ "settings",
+ "theme",
+ "ui",
+ "workspace",
+ "workspace-hack",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.21.3"
@@ -20223,6 +20240,7 @@ dependencies = [
  "nix 0.29.0",
  "node_runtime",
  "notifications",
+ "onboarding",
  "outline",
  "outline_panel",
  "parking_lot",