Add page descriptions/excerpts to improve page previews and SEO #499
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If a page has no description, the page content is used in the
descriptionmetadata. This is fine in some cases (e.g. blog posts) but in pages where Jekyll tags are used near top of the page (e.g.{% include posts.html %}) the tags can appear in the description. This includes the homepage!See related #481.
This PR:
descriptionto most of the core pagesexcerptto most of the spec pages (some had it already)excerptfeeds into the description metadata where it is used