Add some links to the video pages from the home page

We will probably want to revert this commit and do this with a new
link style in the future.

Right now this involves copying images and article titles cross
repo from getting-started-docs to here, and translating them over
again. Which is nasty and what would be solved by a new link style.

But we want the thumbs in this release, so we'll do it like this
for now.
[endlessm/eos-shell#4073]
Merge pull request #7 from endlessm/shell/4073

Add some links to the video pages from the home page
Updated translations from transifex

For the new video thumbnails on the home page of the help docs
Use Spanish content for Portuguese

Our Portuguese translation are not updated and would be half in
English. Spanish is a better substitute for now.

Symlinked the portuguses po file to point to the spanish location and
updated our tx config to update a dummy file with the portuguese translations.

This should all be reverted later.
[endlessm/eos-shell#4064]
Merge pull request #6 from endlessm/shell/4064

Use Spanish content for Portuguese

[endlessm/eos-shell#4064]
Updated translations from Transifex

[endlessm/eos-shell#4085]
Revive old pages we bringing back

We purged a huge amount of content before the last release to
have a consistent set of pages update for endless.

Now that we have more time to update content, we are bringing a
lot back
[endlessm/eos-shell#3910]
New pages from Nuritzi

We are adding a bunch of new pages as part of a big restructure of
pages on the help center

Content not finished yet, some pages are still stubs.
[endlessm/eos-shell#3910]
Remove pages we will no longer use

Mostly these are category pages we won't use with our new structure.
Updated content from Nuritzi

Filling in stubs from the earlier commit, update other pages

[endlessm/eos-shell#3910]
Make some terms consistent

System menu, Start menu->User menu
Program->App
[endlessm/eos-shell#3910]
Remove reference to deja dup

I don't think we ship that application
[endlessm/eos-shell#3910]
Restructure page hierarchy

We now have a much simpler page hierarchy with 6 toplevel pages
which link to all the article pages.

Removed see also links
[endlessm/eos-shell#3910]