This reverts commit 3b4701b240f55b4e97edee7fdc13fec35a76fc5a.

The FAQ page already unabbreviates the FAQ abbreviation. This aids
screen readers to pronounce the abbreviation correctly to increase
comprehension and adds semantics.

Acked-by: Eliot Whalan <ewhal@pantsu.cat>

Sync with Pomf 2.0.x maint branch.

- pages: Add a non-breaking space before "MiB"

Corrects a typo and adds the missing space character to index.

Fixes a typo where the unit symbol was missing a space character before
it.

To avoid automatic line breaks in text "128 MiB", a non-breaking space
character is used instead of a regular space character. If the text
doesn't fit at the end of a line it is moved in its entirety to the next
line.

Reviewed-by: Eliot Whalan <ewhal@pantsu.cat>

I have a belief that Swig banners are a Grunt only thing, and they don't
really integrate very well into Swig anyway. It's kind of a hack, and a
bad one because we don't need it anymore.

By deprecating Swig banners, we should have easier time replacing
Grunt/npm with Make in a future release.

Reviewed-by: Eliot Whalan <ewhal@pantsu.cat>

The <header> element represents a group of introductory or navigational
aids. It is semantically incorrect to use it with only one element
inside.

The <header> element was introduced in commit 87014fa08f. That commit
describes the correct usage of <header> element with multiple elements
inside <header>.

This bug was introduced in commit fd566d3d7f.