fix tor browser legacy wiki redirection

in #40233 (closed), @sysrqb wrote:

I wonder if we can use a rewritemap and rewriterule for dynamically redirecting (almost all?) pages. As an example, if we look at two Tor Browser wiki pages:

(Using the archived version for reference: https://web.archive.org/web/20200617155921/https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser)

https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser
->
https://gitlab.torproject.org/tpo/applications/tor-browser/-/wikis/



https://trac.torproject.org/projects/tor/wiki/doc/TorBrowser/Release_Schedule
->
https://gitlab.torproject.org/tpo/applications/tor-browser/-/wikis/Release-Schedule

I think we can use a prg rewritemap, and following that example:

+        RewriteMap u2d "prg:/path/to/trac_under2gl_dash.pl"
+        RewriteRule ^/projects/tor/wiki/doc/TorBrowser/(.*) "https://gitlab.torproject.org/tpo/applications/tor-browser/-/wikis/${u2d:$1}" [R]

Where trac_under2gl_dash.pl is something like:

#!/usr/bin/perl
$| = 1; # Turn off I/O buffering
while (<STDIN>) {
    s/_/-/g; # Replace underscores with dashes
    print $_;
}

Would something like this be an unacceptable solution?

I responded there, but I figured I would open an issue specifically for this group of pages, to make sure I don't forget about this useful information which is basically:

"Please redirect /projects/tor/wiki/doc/TorBrowser/ to https://gitlab.torproject.org/tpo/applications/tor-browser/-/wikis/. Be careful because underscores are replaced with dashes."