(bug 44566) Separate out page that is transcluded and main help page.

We want to allow the main help page to grow to a reasonable size,
while the transcluded one needs to remain brief.

Change-Id: Ib373c13dd6a8cf5c6edc1f50b41329e9aca6eff9
Merge "(bug 44566) Separate out page that is transcluded and main help page."