Apply newer HTML for permalink photo pages to HTML mockups.
Links should have anchor text; hide it with `text-indent` in CSS.
Remove unused CSS.
Make "sharer" links into flexible "ShareLinks" component.
Apply new "ShareLinks" component to text post types on HTML mockups.
Video auto-fit. (Manually do fe9aca56294a7ee1238d0c422a0cfc9eece6f070.)
Add "ShareLinks" component to all post types.
Merge branch 'master' into tumblr

Conflicts:
	web/index.html
Apply CSS from `master` branch.
Integrate main feature social media share with variable.
Move "Featured media share URL" block above its description.
Localize CSS-generatd content for "Share this" text.
Remove "Share this" text from "ShareLinks" component on main page.
Merge branch 'master' into tumblr
Apply CSS from `master`.