Collaborate on next year's survey

Hi,

To better enable collaboration on the questions for the curl user survey for 
next year, and maybe also increase the chances that we can host them on a 
non-Google property, I have converted them all into markdown and put them in a 
brand new repository:

   https://github.com/curl/user-survey

I started off by making a few pull-requests to show how it can be done now:

   https://github.com/curl/user-survey/pulls

What other improvements should we do?

-- 

  / daniel.haxx.se || https://rock-solid.curl.dev
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