improve existing examples for sqlpage 0.7.2

examples/master-detail-forms/edit_user.sql

@@ -2,9 +2,7 @@ SELECT 'shell' AS component, 'User Management App' AS title, 'user' AS icon, '/'
 
 SELECT 'form' AS component,
     'Edit user' AS title,
-    CASE WHEN $id IS NULL THEN 'insert_user.sql'
-                          ELSE 'update_user.sql?id=' || $id
-    END AS action;
+    'insert_user.sql' || COALESCE('?id=' || $id, '') AS action;
 
 SELECT 'First name' AS name,
     TRUE AS required,

examples/master-detail-forms/insert_address.sql

@@ -1,4 +1,4 @@
 INSERT INTO address (user_id, street, city, country) VALUES ($user_id, :Street, :City, :Country)
 RETURNING
-    'http_header' AS component,
-    'edit_user.sql?id=' || user_id AS location;
+    'redirect' AS component,
+    'edit_user.sql?id=' || user_id AS link;

examples/master-detail-forms/insert_user.sql

@@ -1,5 +1,5 @@
 INSERT INTO user (id, first_name, last_name, email) VALUES ($id, :"First name", :"Last name", :Email)
 ON CONFLICT (id) DO UPDATE SET first_name = excluded.first_name, last_name = excluded.last_name, email = excluded.email
 RETURNING
-    'http_header' AS component,
-    'edit_user.sql?id=' || id AS location; 
+    'redirect' AS component,
+    'edit_user.sql?id=' || id AS link; 

examples/official-site/get_started.sql

@@ -1,2 +1 @@
-SELECT 'http_header' as component,
-    'get started.sql' as location;
+SELECT 'redirect' as component, 'get started.sql' as link;

examples/official-site/manual_setup.sql

@@ -1,2 +1 @@
-SELECT 'http_header' as component,
-    'get started.sql' as location;
+SELECT 'redirect' as component, 'get started.sql' as link;

examples/read-and-set-http-cookies/logout.sql

@@ -3,4 +3,4 @@ SELECT 'cookie' as component,
     'username' as name,
     TRUE as remove;
 
-SELECT 'http_header' as component, 'index.sql' as Location;
+SELECT 'redirect' as component, 'index.sql' as link;