Find redirect solution for the Security Guide

[marble]

#37 (comment)
Related: #37

[marble]

①
Current, suboptimal contents of ~/public_html/typo3cms/SecurityGuide/.htaccess:

`Options +Indexes
# Fix broken search in the singlehtml versions
# If searching, bring the user away from the singlehtml
# (where the search would only give an error 404) and direct him to the default version.
# See https://forge.typo3.org/issues/60838
RedirectMatch permanent (.*)/singlehtml/search\.html $1/search.html
RewriteEngine On
RewriteRule (GeneralInformation|TypesOfThreats|HackedSite|Backups|Introduction|SecurityTeam|GeneralGuidelines|GuidelinesAdministrators|GuidelinesIntegrators|GuidelinesEditors)(.*) https://docs.typo3.org/typo3cms/CoreApiReference/Security/$1/  [R=301,L]
RewriteRule singlehtml(.*) https://docs.typo3.org/typo3cms/CoreApiReference/singlehtml/ [R=301,L]
RewriteRule (stable/)?(.*) https://docs.typo3.org/typo3cms/CoreApiReference/$1Security/$2 [R=301,L]

# Do not rewrite URLs starting with any valid version number followed by a slash
RewriteRule ^(([0-9]+)(\.[0-9]+)(\.[0-9]+)*)/(.*)$ -  [L]
# Do not rewrite URLs starting with the provided words
RewriteRule ^(latest|packages|stable)(.*)$ -  [L]
RewriteRule ^manuals.json(.*)$ -  [L]
# Rewrite the rest into the folder stable/
RewriteRule ^(.*)$ stable/$1

②
I have disabled that .htaccess: mv .htaccess .htaccess.timek.htaccess
③
I have enabled the current default .htaccess which should be used in all base folders of a manual:
ln -s ~/scripts/config/_htaccess-2016-08.txt .htaccess
④
This is the contents of the standard .htaccess of 2016-08:

Options +Indexes

RewriteEngine On

# Do not rewrite URLs starting with any valid version number followed by a slash
RewriteRule ^[0-9]+(\.[0-9]+)(\.[0-9]+)*(-dev)?/(.*)$ -  [L]

# Do not rewrite URLs like '8-dev/'
RewriteRule ^[0-9]+-dev/(.*)$ -  [L]

# Do not rewrite URLs starting with the provided words
RewriteRule ^(latest|master|packages|stable)(.*)$ -  [L]

# still needed?
RewriteRule ^manuals.json(.*)$ -  [L]

# Rewrite other cases into the folder stable/
RewriteRule ^(.*)$ stable/$1

[marble]

This ticket is waiting for somebody willing to invest time. Otherwise I'll close it some time soon.

[sypets]

Please don't close.

[sypets]

I do think the above rule should have worked:
RewriteRule (GeneralInformation|TypesOfThreats|HackedSite|Backups|Introduction|SecurityTeam|GeneralGuidelines|GuidelinesAdministrators|GuidelinesIntegrators|GuidelinesEditors)(.*) https://docs.typo3.org/typo3cms/CoreApiReference/Security/$1/ [R=301,L]
(#42 (comment))

[DanielSiepmann]

Let's proceed within #37