Changes

* If you upload a file to Slack and want to download it from its URL using the wget command on command-line, make sure you get a public link from the person who uploaded the file, otherwise the file won't be downloaded. (I was trying to figure out why the McNair logo that Julia sent me on slack wasn't showing up on the website, but it turns out I just needed a public link to the file, which should look something like https://files.slack.com/files-pri/T0JA2A9Q9-F0RL0G4BZ/mcnair.png?pub_secret=30505f5d02).

* the @font-face rule doesn't seem to work in Common.css... I never got past this problem. I think the .tff file for the font may have failed to download onto the server properly, but I haven't found a good way to test for that case. Also, I tried using an absolute URL (i.e. http://128.42.44.180/mediawiki/resources/assets/fonts/franklin-gothic-book.ttf) when specifying the @font-face rule, but it doesn't seem to help. Using an absolute URL to the slack file public URL (i.e. https://files.slack.com/files-pri/T0JA2A9Q9-F0RLDB3G8/download/franklin-gothic-book.ttf?pub_secret=327cdaaeb8) doesn't seem to work either.