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This patch changes how lessons are organized. Previously, they were
categorized by user type (new user, experienced user, developer). UXR
discovered that this method of organization could make it more difficult
for users to find the content they are looking for. The new strategy is
to organize lessons based on content, which makes finding information
easier.

This patch also adds the OOBE lessons to the main
menu; this will allow users to revisit the content whenever they
would like to. To keep the visual styling consistent, titles were
added to each of these lessons. However, this created an issue in how
initial focus is placed when interactive lessons are shown; we don't
actually want to focus the title for these lessons, rather the text
content that instructs users which keystrokes to press. To solve this
issue, this change also adds logic in tutorial_lesson.js for where to
place focus when a lesson is shown.

Lastly, this change fixes an issue where UserActionMonitor wasn't
properly destroyed, thus continuing to block ChromeVox execution even
after an interactive lesson was exited.

Bug: 1124070
Change-Id: If13952d8a7b6e954fc7292e01444a59fe6a624ef
AX-Relnotes: N/A
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412223
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809193}