For some reason, while applying it in 36cb75c7, Ulrike didn't apply
all the changes.

This also:

- Removes the weird purple border we had on these buttons.
- Use a consistent height on all such buttons.

Originally, the reasons for it was to make it possible to use bold and
underline on some words in the titles. But:

- Expert UX review told us that underline text was very often confused
  with links, while these titles are not clickable.
- Bold is meant to easy scanning in text but headings should be
  themselves short enough not to need additional scanning.
- They were style and aligned differently that everywhere else on our
  website and this inconsistency was no backed up with any good
  argument.
- Their content was 100% duplicate from [[!meta title and already caused
  painful maintenance work.

So let's get rid of them, simplify our code, reduce content
duplication, and increase style consistency.

Website: explicitly add sort="age" to all inline directives I can easily & mechanically patch (refs: #12053).

A serious performance regression was brought by ikiwiki 3.20150614. One of the
few changes introduced in that release was to change the default sorting, for
inline directives, from "age" to "age title". Presumably the latter is
substantially slower, possibly since it has to process the *content* of all
included pages in order to retrieve their title, which may mean that a subset of
pages are processed more than once.

Let's keep the full version in the Git checkout for some times, just in
case it might be useful to use in some circumstances (for debugging for
example).

If you know what you are doing you otherwise have to go through 4 pages
to get to the download. The verification process is enforced in the same
way on /install/download.

  - Two of them pointed to the "stay tuned" section. Now that we have
    incremental upgrades, and the subscription form to amnesia-news on the
    homepage of the browser, it's ok not to put that much emphasis on this.

This might format PO files in a nicer way for translators.

Conflicts:
	wiki/src/install/debian.html
	wiki/src/install/debian/usb.mdwn
	wiki/src/install/debian/usb/overview.html
	wiki/src/install/expert/usb.mdwn
	wiki/src/install/expert/usb/overview.html

Conflicts:
	wiki/src/install/debian.html
	wiki/src/install/debian/usb.mdwn
	wiki/src/install/debian/usb/overview.html
	wiki/src/install/expert/usb.mdwn
	wiki/src/install/expert/usb/overview.html