fix(docs): move testing docs to website docs

docs/docs/dev-tests.md

@@ -1,6 +1,6 @@
 # Basics
-Any folder under `/app/tests` containing `native_posix.keymap` will be selected when running
+Running tests requires native [posix support](./dev-posix-board). Any folder under `/app/tests`
-`./run-test.sh all`.
+containing `native_posix.keymap` will be selected when running `./run-test.sh all`.
 
 `test_case/events.patterns` contains sed patterns that will select the interesting output from the
 application

docs/sidebars.js

@@ -20,6 +20,7 @@ module.exports = {
       "dev-setup",
       "dev-boards-shields-keymaps",
       "dev-posix-board",
+      "dev-tests",
     ],
     "Dev Guides": ["dev-guide-new-shield", "dev-guide-usb-logging"],
   },