mkdocs.yml - Rearrange "Testing" subnav

1. Add new entries for Protractor, Codeception, and QUnit

2.  This menu includes (a) some pages about the overall testing process and
(b) some pages about specific tools.  Consistently put the general before
the specific.

mkdocs.yml

@@ -183,12 +183,18 @@ pages:
     - hook_civicrm_unhandledException: hooks/hook_civicrm_unhandledException.md
 - Testing:
   - Testing: testing/index.md
-  - PHPUnit Tests: testing/phpunit.md
-  - Karma (JS) Tests: testing/karma.md
-  - Selenium Tests: testing/selenium.md
   - Continuous Integration: testing/continuous-integration.md
-  - Upgrade Tests: testing/upgrades.md
-  - Manual Testing: testing/manual.md
+  - PHP:
+    - PHPUnit Tests: testing/phpunit.md
+    - Codeception Tests: testing/codeception.md
+    - Selenium Tests: testing/selenium.md
+  - Javascript:
+    - Karma Tests: testing/karma.md
+    - Protractor Tests: testing/protractor.md
+    - QUnit Tests: testing/qunit.md
+  - Other:
+    - Upgrade Tests: testing/upgrades.md
+    - Manual Tests: testing/manual.md
 - Security:
   - Secure Coding: security/index.md
   - Securing Inputs: security/inputs.md