feat: multi-package install and bakery update all

- bakery install now accepts one or more package names
- bakery update all treated as update-everything (same as bare update)
- bump version to 0.2.0

Cargo.lock

@@ -81,7 +81,7 @@ checksum = "f2032f911046de80f0a198e0901378627c33f59ea0ac00e363d481118bd70a53"
 
 [[package]]
 name = "bakery"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "anyhow",
  "chrono",
@@ -118,7 +118,7 @@ dependencies = [
 
 [[package]]
 name = "bread-theme"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "dirs",
  "gtk4",