refactor: use import Lake in package configurations

Lake/Init.lean

@@ -26,7 +26,7 @@ def mainFileContents :=
 "
 
 def pkgFileContents (pkgName : String) :=
-s!"import Lake.Package
+s!"import Lake
 
 def package : Lake.PackageConfig := \{
   name := \"{pkgName}\"

README.md

@@ -43,7 +43,7 @@ def main : IO Unit :=
 Lake also creates a basic `package.lean` for the package:
 
 ```lean
-import Lake.Package
+import Lake
 
 def package : Lake.PackageConfig := {
   name := "hello"

examples/bootstrap/package.lean

@@ -1,5 +1,4 @@
-import Lake.Package
-
+import Lake
 open Lake System
 
 def package : PackageConfig := {

examples/deps/a/package.lean

@@ -1,4 +1,4 @@
-import Lake.Package
+import Lake
 
 def package : Lake.PackageConfig := {
   name := "a"

examples/deps/b/package.lean

@@ -1,4 +1,4 @@
-import Lake.Package
+import Lake
 
 def package : Lake.PackageConfig := {
   name := "b"

examples/deps/foo/package.lean

@@ -1,5 +1,4 @@
-import Lake.Package
-
+import Lake
 open Lake System
 
 def package : PackageConfig := {

examples/ffi-dep/package.lean

@@ -1,6 +1,4 @@
-import Lake.Package
-import Lake.BuildTargets
-
+import Lake
 open Lake System
 
 def package : PackageConfig := {

examples/ffi/package.lean

@@ -1,6 +1,4 @@
-import Lake.Package
-import Lake.BuildTargets
-
+import Lake
 open Lake System
 
 def cDir : FilePath := "c"

examples/git/package.lean

@@ -1,5 +1,4 @@
-import Lake.Package
-
+import Lake
 open Lake System
 
 def package : PackageConfig := {

examples/hello/package.lean

@@ -1,4 +1,4 @@
-import Lake.Package
+import Lake
 
 def package : Lake.PackageConfig := {
   name := "hello"

examples/io/package.lean

@@ -1,4 +1,4 @@
-import Lake.Package
+import Lake
 
 def package : Lake.IOPackager := fun path args => do
   IO.println s!"computing io package in {path} with args {args} ..."

examples/main/package.lean

@@ -1,4 +1,4 @@
-import Lake.Package
+import Lake
 
 def package : Lake.PackageConfig := {
   name := "foo"