Use Apiary to show updated info on home page

[tripu]

Inject dynamically, from the public API:

• Name of the group in several places (kind of trivial, yes)
• Updated description of the group
• Total period chartered, up to end of last charter

While at it, fix this too (static content):

• Info about team contacts and chairs was not up to date; fixed (Apiary can populate that too, but currently the hyperlinks it creates lead to user profile pages like https://www.w3.org/users/6222, that are not public)
• Added a missing <section> for one of the main chunks that have a <h2> heading

(Trailing spaces in some lines removed, too.)

[chaals]

ping @tripu

[tripu]

@chaals, a mere eighteen months late, this PR is ready to merge!
🙄

[xfq]

LGTM

[xfq]

Merging.

[xfq]

Thanks, @tripu!

[ylafon]

Looks a bit weird on Safari, also the list of specification could benefit from a non-random sorting algorithm (like alphabetical, or last published)

[tripu]

(@ylafon's comments refer to Unitas — not Apiary, this PR, or this repo — which is no longer maintained.)

“Looks a bit weird on Safari”

Filed here:
w3c/Unitas#38 (comment)

“Also the list of specification could benefit from a non-random sorting algorithm (like alphabetical, or last published)”

Filed here:
w3c/Unitas#36
but ideally, should be fixed server-side:
w3c/w3c-api#71