Trim mirroring docs (#1036)

Enhancement: Enable `array_syntax` fixer

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

Closes GH-659.

Swap uses of _SERVER[DOCUMENT_ROOT] for __DIR__

1/n - Update / and /include/ only.

Remove references, redirects, and selection of mirrors

Sync final and leading newlines

This patch adds some missing newlines, trims some multiple redundant
final newlines into a single one, and trims few redundant leading
newlines.

Sync final and leading newlines

This patch adds some missing newlines, trims some multiple redundant
final newlines into a single one, and trims few redundant leading
newlines.

According to POSIX, a line is a sequence of zero or more non-'<newline>'
characters plus a terminating '<newline>' character. [1] Files should
normally have at least one final newline character.

C89 [2] and later standards [3] mention a final newline:
"A source file that is not empty shall end in a new-line character,
which shall not be immediately preceded by a backslash character."

Although it is not mandatory for all files to have a final newline
fixed, a more consistent and homogeneous approach brings less of commit
differences issues and a better development experience in certain text
editors and IDEs.

[1] http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206
[2] https://port70.net/~nsz/c/c89/c89-draft.html#2.1.1.2
[3] https://port70.net/~nsz/c/c99/n1256.html#5.1.1.2

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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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Work through the remaining FIXME pages; put them in their correct categories,
and update aged markup as appropriate.

Yes, I did check the new markup on the non-beta site too.

Well, not Yahoo! anymore, and let's just make it generic in case it changes again.

Add current config option (ignored in old-web), and FIXME placeholders for pages
not in any menu yet

Style "preformatted text" :)

Add info for new "outbound connection" test (for bug #46562)

xhtml..

Use <a name=""></a> instead of <a name="" />. Thanks to Hannes for noticing.

Put all mirror problems and troubleshooting information into one file.
Much of this information was gathered from the mirror tests and the list
archives including many words written by Hannes

Put all mirror problems and troubleshooting information into one file.
Much of this information was gathered from the mirror tests and the list
archives including many words written by Hannes, and some were taken from
the troubleshooting guide within mirroring.php. Most problems include
links to individual mirror tests.
# It's fairly complete but could use some additional information.
# We may want to create a separate test suite for mirror maintainers to use.

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