Rewrite in wsgi

[erkyrath]

I updated the server to Python 3.11, and now we're getting deprecation warnings:

/var/ifarchive/cgi-bin/upload.py:73: DeprecationWarning: 'cgi' is deprecated and slated for removal in Python 3.13
  import cgi
/var/ifarchive/cgi-bin/upload.py:438: DeprecationWarning: 'cgitb' is deprecated and slated for removal in Python 3.13
  import cgitb

Won't matter for a while, but someday it will matter.