Establish HTTP redirect to GitLab for /gitweb

[ehuelsmann]

gitweb URL structure:

/gitweb/

--> lists the repository listing

/gitweb/?...

parameters:

1. p=<relative-path>; the project/repository to be viewed
2. a=<summary|tree|commitdiff(_plain)?|shortlog|log|commit|patch|search|blobdiff(_plain)?|blob|blame|history>; type of page content to be returned
3. h=<commit-hash>
4. f=<within-repo-path(file-or-directory)>; relevant for path/blob based requests
5. hb=<hash-of-?>
6. hp=<hash-of-?>
7. hpb=<hash-of-?>
8. ds=sidebyside; side-by-side view instead of uni-diff (for diff output)

[ehuelsmann]

Progress: I've implemented a gitweb redirect map script in Perl (I know, I know); it's deployed as /usr/local/bin/gitweb-rewritemap, but needs to be implemented in the Apache config.

I'd propose like this:

   RewriteMap gitwebmap prg:/usr/local/bin/gitweb-rewritemap

And the following rewrite rules:

   RewriteRule /gitweb/? https://gitlab.common-lisp.net/explore/projects
   RewriteRule /gitweb/\?(.*)  ${gitwebmap:$1}

[ehuelsmann]

This ticket is sufficiently handled. Execution is all that remains.