Gatsby: Create pullquote styles for .org site

[amberleyromo]

Pulled out of #9847.

Points of consideration:

• multiple styles (quote style, highlight style) -- as you've suggested, @greglobinski
• implement using custom components

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[greglobinski]

New variations of the designs

1. a quotation mark to indicate it's a quote added

1. the 'invisible' yellow color removed

@lindaleebumblebee

[lindaleebumblebee]

Thank you. Both are great, but now I like the first one the best (with the box and 'stars') :)

[greglobinski]

There are three variants of the Pullquote, they differ only in stars' placement, if there are more that three Pullquote instances on the page, the variants application starts from the A variant again - A, B, C, A, B, ...

/ @lindaleebumblebee @amberleyromo

Desktop variants

Mobile variants

[lindaleebumblebee]

Love it! Looks great.

[amberleyromo]

Closed in #10190