Bug#1109867: www.debian.org: Extend Releases table with data for all releases

Thanks for your useful suggestions. I'm happy with everything.

I also think that 'End of LTS' is better than EOL LTS and same for ELTS.

Also the name 'Historic releases' makes it clearer that you should not use
those releases any more.

Maybe we can highlight the current stable release in the table (on www.d.o),
because it already contains seven releases.

BTW, I like the colors in the wiki table.
But on https://wiki.debian.org/LTS the column 'schedule' is not that
readable as in https://wiki.debian.org/LTS/Extended which clearly has
two columns for begin and end of ELTS.