Preprocess: Update CSS fixes for the new theme
Preprocess: Fix the removal of 'noprint' elements
Preprocess: fix the removal of google-analytics scripts
Preprocess: all template edit links are noprint, thus this snippet is not needed
Preprocess: replace all :nth-child(1) with :first-child in css files

This fixes viewing of the documentation in Qt Assistant and related tools.
Preprocess: remove query string from links to the css files
Preprocess: add several css workaround rules
 * Qt Assistant doesn't like the size of some elements being defined in
   pixels. Translate px into em in these cases.
 * Qt Assistant doesn't parse @font-face declarations. Add work-around
   rules to request fonts by font name.
 * Qt Assistant doesn't like the main content box using absolute
   positioning. It isn't needed in our case, thus can be overridden with
   static in our case.
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