Restore commit 4cb616fed6 (Tutorial: Provide a source archive when
published on cmake.org, 2022-04-27, v3.23.2~22^2). Its effects were
accidentally reverted by commit 9784834b4c (Help: Use `*.rst` extension
for included files, 2025-04-07, v4.1.0-rc1~354^2).
Reported-by: Vito Gamberini <vito.gamberini@kitware.com>
