page.c: Set Content-Disposition when serving files

So far, slcl used the default browser behaviour (i.e.,
Content-Disposition: inline), which means files were typically shown on
the web browser itself. However, this caused two issues:

- Users would have to right-click -> "Save Link As..." to download a
file, which might be inconvenient for some users.
- The original file name would not be retrieved for publicly shared
files.

Now, file download is always requested to the browser, and the original
file path is retrieved via readlink(2).

0 files changed, 0 insertions, 0 deletions