[css3-page][css3-gcpm] Move :blank to css3-page, per WG resolution

[css3-page] Link to Page Progression for :left and :right pseudo-classes.

[css3-page] Fix "::before and ::after pseudo-elements".

[css3-break] Some editorial refactoring of page breaks.

[css3-transitions] Update previous version link for tomorrow's publication.

[css3-page] Remove most of the Page Break section, which is now in css3-break

[css3-page] `page: auto` is ASCII case-insensitive.

[css3-page] Fix a reference to css3-images

[css-counter-styles-3] Fix the other occurence of the negative sign for Chinese.

[css-counter-styles-3] Add a note to 'symbols' about the syntax of idents.

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