feat: change insert query for documentation

- "_blank" to open the link in a new tab
- "_self" to open it in the same tab
- "_parent" to open it in the parent frame
- "_top" to open it in the full body of the window

examples/official-site/sqlpage/migrations/01_documentation.sql

@@ -972,7 +972,8 @@ INSERT INTO parameter(component, name, description, type, top_level, optional) S
     ('theme', 'Set to "dark" to use a dark theme.', 'TEXT', TRUE, TRUE),
     ('footer', 'Muted text to display in the footer of the page. This can be used to display a link to the terms and conditions of your application, for instance. By default, shows "Built with SQLPage". Supports links with markdown.', 'TEXT', TRUE, TRUE),
     ('preview_image', 'The URL of an image to display as a link preview when the page is shared on social media', 'URL', TRUE, TRUE),
-    ('navbar_title', 'The title to display in the top navigation bar. Used to display a different title in the top menu than the one that appears in the tab of the browser.', 'TEXT', TRUE, TRUE)
+    ('navbar_title', 'The title to display in the top navigation bar. Used to display a different title in the top menu than the one that appears in the tab of the browser.', 'TEXT', TRUE, TRUE),
+    ('target', '"_blank" to open the link in a new tab, "_self" to open it in the same tab, "_parent" to open it in the parent frame, or "_top" to open it in the full body of the window', 'TEXT', TRUE, TRUE)
 ) x;
 
 INSERT INTO example(component, description, properties) VALUES