[Dev] New wiki template "Historical"

[Esteban Carnevale]

I created this template: https://wiki.parabola.nu/Template:Historical

This template can be used instead of deleting the page so it remains 
accessible and deprecated information is not shown.

It automatically adds articles to the category "Archives":
https://wiki.parabola.nu/Category:Archives

These articles, this category, may need to be excluded from ParabolaWiki 
text searches so they don't pollute results with old information.

As example, this is the first wikipage using it:
https://wiki.parabola.nu/Parabola_GNU_Statusnet_Instance


-- 
Esteban Carnevale <alfplayer at mailoo.org>