Enhancement: Enable `array_syntax` fixer

Co-authored-by: MathiasReker <mathias@reker.dk>

Closes GH-659.

Swap uses of _SERVER[DOCUMENT_ROOT] for __DIR__

3/4 - Update archive directory.

Trim trailing whitespace

This patch cleans all redundant trailing whitespace across the
repository except for the icalendar files.

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
use

Remove unused Git attributes ident

The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.

In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.

This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.

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Kill off XHTML

Long live HTML5! =)

Reimplement the news archive caching

Most of these don't work, others are just to old.

There is maybe one or two here that are ok, but that hardly justifies keeping this alive

Fix/enable archive sidebar

Remove this links.. hasn't been maintained for a long time

Add Last-Modified header (see bug#47261)

utilize real folders instead of pseudofoldering news archives with filename prefixes