Various copy updates cross-site

Adds copy to most pages about how to do and use various things.
Adjustments for photo positioning

This change allows photos to work well on narrow viewports and for
photos to be put into grids on larger viewports.
Standardize installation screenshots

Makes these of a standard size.
Swap configuration screenshots

These new ones have the newly-added help button.
Additional screenshots for services

Adds screenshots of all but the Mac OS X Say service, and adjusts some
of the style rules so that they are more forgiving with large images.
Remove shell task for deployment

This is no longer present, being merged into version.