Purge most of the help pages

We are keeping a white listed and much smaller list of documents
that we know will be helpful and we have time to review and fixup

Some of what we are loosing here will doubtlessly be helpful.
When we have time to sift more carefully through this list we
should start bringing a lot of this stuff back.
[endlessm/eos-shell#3909]
Removed a couple more pages

That make reference to the activities overview or other UI we don't have.

We don't really have time for more translations, so these are getting the axe
[endlessm/eos-shell#3909]
Fix broken links

After the great purge a large number of links in the various pages were broken,
this clears all the broken links out so the user can't get to error page.

[endlessm/eos-shell#3909]
Balance out link lists in overview pages

Most of the overview pages have lists of links for pages on a topic. After
purging the articles and removing links, a lot of the lists have only one entry.
And make our home page look strange. This commit adds new links for these lists
so they all have a good number of entries
[endlessm/eos-shell#3909]
Switch keyboard page layout

It looks rather strange in the current layout as much of its former content was
purgeg. Switching it to just list the two articles it links to clearly

Did not need to add any new content strings to do this so we should be fine on
translations
[endlessm/eos-shell#3909]
Tutorial link is not a note

It shouldn't be a note. Inside its own section it will be easily theme-able
[endlessm/eos-shell#3909]
Merge pull request #4 from endlessm/shell/3909

Shell/3909