[post] update content
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[cfg] fix url to avatar, add url to big qr-code
[post] update content
[templates] remove scrollspy from body
[templates] fix html.presentation
[post] add webcomponent presentation
[post] update content
[post] update content
[post] update content
[post] update content
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Revert "Delete 2014-02-18-frontend.web-components.md"

This reverts commit df959c24e3352672d437dea0bbf7cc97a5d02ede.
[post] update content