archwiki: LocalSettings.php: update URLs and comments

• Remove www. from archlinux.org,
• Use HTTPS for the license link,
• Update $wgGitRepositoryViewers,
• Update comments referencing paths and URLs.

added 3 commits

• a3f03525...5211f9ac - 2 commits from branch archlinux:master
• d2c62407 - archwiki: LocalSettings.php: update URLs and comments

Compare with previous version

mentioned in commit b04e1fb0

merged